Circuit Electronic Circuit LED Blinking Schematics

LED Blinking
The design of the project includes connecting 4 LEDs in the +12V from the computer. The LEDs are soldered to a 2-position switch that will connect to TIP31.


The intensity transmitted by the P2 connector is taken by TIP31 which causes the LEDs to blink with the music. A small black box is used to install everything inside. Six holes were made where 4 in the top for LEDs and the switcher and cables on one hoe in each side. To arrange the components easier inside the box, the LEDs were soldered with one small cable connecting each one.
Circuit LED Blinking
This simple project aims to build a circuit that can make the LEDs blink with the sound that comes out from the P2 connector. Shown in the video is the LED blinking in action.

The 3 pins on the P2 connector consist of left channel, right channel, and the ground pin being the bigger. The ground from TIP31 must be connected on the other pin from the switcher. If there is any signal coming from the P2 connector, the LEDs will blink or will always be ON if it is in another direction.
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Circuit Electronic Circuit Vehicle Voltage Regulator Schematics

Voltage Regulator
In vehicles it is often required to have a powerful yet stabilized voltage that’s not affected in any way by fluctuations of the battery voltage. The circuit shown here does the job using discrete and inexpensive parts only.


While its low cost is a definite advantage over just about any kind of regulator IC, on the downside we have a minimum voltage drop of 2 volts - in fact the output voltage can be set to any value between 1.8 V and about 10 V. Continuous loads up to 100 watts can be handled, while peak values of 140 W should not present problems.

Remember, the case of a 2N3055 is connected to the collector which is at battery-positive potential. If necessary the voltage regulator may be bypassed by an external switch connecting the battery + terminal with the output terminal. The switch, if used, should be capable of passing considerable currents - at relatively low output voltages (up to about 6 V) currents of up to 15 A (continuous) or 20 A (peak) may be expected. Although the output current is reduced to 10 A when the 10-V level is approached, it is better to be safe than sorry.
Circuit Vehicle Voltage Regulator
The power stage consists of two parallel-connected 2N3055 transistors in TO-3 cases. Because of their high base current requirement, a driver transistor type BD241B is incorporated. The feedback voltage arrives at the inverting input of the regulator IC, a type 741 opamp. The level of the reference voltage at the inverting input is adjusted with potentiometer (or preset) P1. The circuit board, of which the layout is given here, accommodates all parts including the two 2N3055 power transistors. As a matter of course, they should be properly cooled.
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Circuit 50 Watt Amplifier Schematics

This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.
This is the schematic of the 50 Watt Amp
Parts

R1(1)200 Ohm 1/4 W Resistor
R2(1)200K 1/4 W Resistor
R3(1)30K 1/4 W Resistor
R5(1)1K 1/4 W Resistor
R6(1)5K 1/4 W Resistor
R7,R10(2)1 Meg (5%) 1/2 W Resistor
R8,R9(2)0.4 Ohm 5 W Resistor
R11(1)10K Pot
R12,R13(2)51K 1/4 W Resistor
R14(1)47K 1/4 W Resistor
C1(1)100uF 35V Electrolytic Capacitor
C2(1)0.011uF Capacitor
C3(1)3750pF Capacitor
C4,C6(2)1000pF Capacitor
C5,C7,C8(3)0.001uF Capacitor
C9(1)50pF Capacitor
C10(1)0.3uF Capacitor
C11,C12(2)10,000uF 50V Electrolytic Capacitor
U1,U2(2)741 Op Amp
U3(1)ICL8063 Audio Amp Transister Driver thingy
Q1(1)2N3055 NPN Power Transistor
Q2(1)2N3791 PNP Power Transistor
BR1(1)250 V 6 Amp Bridge Rectifier
T1(1)50V Center Tapped 5 Amp Transformer
S1(1)SPST 3 Amp Switch
S2(1)DPDT Switch
F1(1)2 Amp Fuse
SPKR1(1)8 Ohm 50W Speaker
MISC(1)Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

  1. I know I skipped R4. That is not a problem :-)

  2. Distortion is less than 0.1% up to 100HZ and increases to about 1% at 20kHz.

  3. I haven't been able to find anyone who sells a suitable T1. You can always use two 24V 5A units in series. If you are building two amps (for stereo), then I would suggest using an old microwave transformer and rewinding it. Follow the instructions in the 12V To 120V Inverter, execpt wind 26 turns, twist a loop (center tap) and wind 26 more turns. That should work out to around 50 volts. You may need to add or remove turns depending on your transformer.

  4. Q1 and Q2 will require heatsinks.

  5. You may have trouble finding U3 because it is discontinued. Please don't email me about sources...I can't find it either. See if any of the sources in Where To Get Parts has it. A possible source was sent in by JBWilliams

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Circuit IRF44 Mosfet based on 100 Watt Inverter Circuit Schematics

IRF44 Mosfet based on 100 Watt Inverter CircuitIRF44 Mosfet based on 100 Watt Inverter Circuit

This inverter circuit can offer a really stable 230V Output Voltage. Frequency of operation is decided by a VR1 and is generally set to 60 Hz. varied “off the shelf” transformers can be used. Or Custom wind your own for best results. additional MosFets can be paralleled for higher power. it's recommended to own a “Fuse” within the Power Line and to perpetually have a “Load connected”, while power is being applied. The Fuse ought to be10 Amps per one hundred watts of output. the ability leads must be serious enough wire to handle this High Current Draw.

IRF44 Mosfet
Absolute Maximum Ratings of IRF44 Mosfet
  • Continuous Drain Current (25°C, 10V) = 49 A
  • Continuous Drain Current ( 100°C, 10V) = 35 A
  • Pulsed Drain Current = 160 A
  • Power Dissipation = 94 W
  • Gate-to-Source Voltage = ± 20 V
  • Avalanche Current = 25 A
  • Operating Junction = -55 to + 175
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Circuit RS-232 POWER TEMPERATURE SENSOR CIRCUIT DIAGRAM Schematics

RS-232 POWER TEMPERATURE SENSOR CIRCUIT DIAGRAM
The temperature sensor converts this temperature into a square wave with a frequency proportional to the absolute temperature of its package, while drawing little supply current from the power source. The amplitude of the output signal is equal to the power supply of the chip, and must be sent over a cable to the host system. The use of a RS-232 interface, low-power dedicated chip enables the communication, while providing power to the sensor.
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Circuit ROOM TEMPERATURE CONTROLLER USING LM35 SCHEMATIC DIAGRAM Schematics

ROOM TEMPERATURE CONTROLLER USING LM35 SCHEMATIC DIAGRAM
When the temperature on IC LM35 is low, the output voltage also low. If the electric voltage of the transistor is below the transistor active area, the voltage will be blocked, LED will off, relay for the fan circuit in open condition, thus the fan is off.

When the temperature of LM35 is high, the output voltage is also high. If the transistor electric voltage in the transistor’s active area, the LED will on, relay on the fan in close condition, thus the fan will be turn on.

Components :
Resistor R1 : 10k ohm
Resistor R2 : 4.7M ohm
Resistor R3 : 1.2k ohm
Resistor R4-R5 : 1k ohm
Resistor R6 : 330 ohm
Capacitor C1 : 0.1 uF
Polar capacitor C2 : 470 uF/25V
IC1 : LM35
IC2 : TL431
IC3 : LM358
Q1 Transistor PNP : BC557
Zener diode D6 : 13V/400mW
Diode D1-D2 : 1N4148
Diode D3-D4 : 1N4007
Relay K1 : 12V SPDT
LED
12V power supply
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Circuit PHONE CONVERSATION RECORDER SCHEMATIC DIAGRAM Schematics

PHONE CONVERSATION RECORDER SCHEMATIC DIAGRAM
D1-D4 diodes serves as a device to convert the alternating current from the telephone line to become direct current in order to be used as a voltage activator. 12V zener diode lowers the voltage to 12V. When the phone receiver has not been appointed, the T1 voltage value will be low. This causes the transistor T2 on its cut off state and deactivate the relay. If the phone receiver is picked up, the voltage flows from T1 to T2. This activates the relay and turn the tape recorder on.

Components list :

Resistor R1 : 8k ohm
Resistor R2 : 2k2 ohm
Resistor R3 : 1M ohm
Resistor R4 : 100k ohm
Resistor R5 : 4k7 ohm
Diode D1-D4, D6 : 1N4001
Zener diode D5 : 12V
Transistor T1-T2 : BC548
Polar capacitor C1 : 0.001 uF/150 V
Polar capacitor C2 : 100 uF/25 V
Relay : 6V, 100 ohm
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Circuit LM3875-High Audio Amplifier 56W Schematics

LM3875-High Audio Amplifier 56W
The LM3875 is an audio amplifier for high power output capable of delivering 56W of continuous average power to a load 8. The performance of the LM3875, utilizing its maximum instantaneous auto temperature (° Ke) (Spike ™) protection circuitry, places it in a class above discrete and hybrid amplifiers by providing a yes, dynamically protected area of safe operation (SOA). SPIKE protection means that these parts are fully protected against output overvoltage, voltage surges caused by shorts to the supplies, the peak temperature thermal runaway, and instantaneous.

This amplifier circuit is based on the non-inverted GainClone standard configuration. I did some calucaltions the feedback resistor and other components in order to check the gain, etc. For more background on the calculations relevant to GainClones in the background section.

LM3875-High Audio Amplifier 56WParameters IC LM3875

Output Current 6000 mA.
Offset Voltage max, 25C 10 mV.
Gain Bandwidth 8 MHz.
Supply Min 20 Volt.
Supply Max 84 Volt.
Supply Current Per Channel 30 mA.
PowerWise Rating 2 3750 uA/MHz.
Slew Rate 11 Volts/usec.
Input OutputType Not Rail to Rail.
Max Input Bias Current 1000 nA.
Special Features AvCl>10.
Function Op Amp.
Channels 1 Channels.
Temperature Min 0 deg C.
Temperature Max 70 deg C.
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Circuit 12 watt FM Transmitter circuit Schematics

12 watt FM Transmitter circuit12 watt FM Transmitter circuit

The advantages of FM modulation is free from the influence of the disturbance of air, bandwidth (broadband) is larger, and the high fidelitas. Compared to the AM system.

FM transmitter is a modification of the FM transmitter on the market (s Saturn type 038). several series of modifications and additions can produce energy Boster number to about 12 watts.

of the series after this work is quite good, the signal generated is stable and strong enough
time in no hurry to do it directly, but usually do each part in sequence so that the error may be earlier

the first part of the work is in the oscillator, after the raft can try to turn radio waves in free mode and set the radio volume so clearly audible hiss. turn the core Koker whistle on the radio is, if you get a signal in a robust and stable set of oscillator has been working with both.

the next section can start at the raft, after the end of the second set trimer (C8 and C11) in the buffer, in turn can feed even the largest steel cables and the older children. If the series works well, there are approximately 0.25 watts

for more resources that can be added over the wider range Boster 12 watts, so the distance will be increased to up to seven times.
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Circuit MAGNETIC SENSOR SCHEMATIC CIRCUIT DIAGRAM Schematics

MAGNETIC SENSOR SCHEMATIC CIRCUIT DIAGRAM
The principle of this circuit is, whenever a magnet comes close to the sensor, then the sensor will flow the output voltage to IC1. The output voltage will activate the timer which will then activate the relay controlled by IC2.

Component List :

Diode D1 : 1N4001
Resistor R1 : 10k ohm
Resistor R2 : 470k ohm
Resistor R3 : 1k ohm
Resistor R4 : 47k ohm
Polar capacitor C1 : 2.2 uF/16V
Polar capacitor C2 : 470 uF/16V
Transistor T1 : SL100
IC1 : NE555
IC2 : CD4013
Relay RL1 : 12 V, 200 ohm
Magnetic Sensor
5mm LED
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Circuit LOCAL TELEPHONE LINE WITH DIVERTING SWITCH CIRCUIT SCHEMATIC DIAGRAM Schematics

LOCAL TELEPHONE LINE WITH DIVERTING SWITCH CIRCUIT SCHEMATIC DIAGRAM
In normal state, telephone no.1 and telephone no.2 can be used as an intercom when telephone no.3 is connected with the phone cable. To be used as an intercom, pick up telephone no.1 and push switch S1, then piezo buzzer 2 will sound, and so on.

Components :
Resistor R1 : 4.7k ohm
Polar capacitor C1 : 2.2uF/100V
PZ1-PZ3 : Piezo buzzer
S1-S2 : Push button
S3 : ON/OFF stereo switch
12V DC/200 mA power supply
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Circuit HEADPHONE CIRCUIT FOR FIXED TELEPHONE LINE SCHEMATIC DIAGRAM Schematics

HEADPHONE CIRCUIT FOR FIXED TELEPHONE LINE SCHEMATIC DIAGRAM
This circuit requires low power, therefore can be installed parallel with the telephone. Transistor T1, Resistor R2,R3, and Zener diode are used to lower the input voltage become 5V. Transistor T2, resistor R6,R7, and capacitor C5 are used as the sound amplifier. This circuit is equipped with condenser microphone to speak and earphone to hear.
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Circuit DIGITAL VOLUME CONTROL SCHEMATIC DIAGRAM Schematics

DIGITAL VOLUME CONTROL SCHEMATIC DIAGRAM
It uses one IC DS1669 and some additional components. S1 works as an addition to audio volume, S2 works as audio volume subtractor.

Components list :

Capacitor C1 : 0.1 uF
Switch S1-S2 : Push button
IC : DS1669
5V DC power supply
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Circuit DIGITAL COMBINATION LOCK CIRCUIT DIAGRAM Schematics

DIGITAL COMBINATION LOCK CIRCUIT DIAGRAM

The output of this circuit can be connected with relay as an ON/OFF control to the electronic devices. This circuit works with 5-12V power supply. To store the combination, connect the IC push button switch with the pin 3,4,5, and 6. For an example, S1 with pin 3, S2 to pin 4, S3 to pin 5, and S4 to pin 6. This will result 1234 combination. Connect S5-S8 with pin 2. This will cause to reset the IC if the combination is wrong. Relay will turn to active when the combination is correct.

Components :
Diode D1 : 1N4148
Volt regulator IC : LM317
Polar capacitor C1 : 1 uF/25V
Polar capacitor C2 : 220 uF/25V
Resistor R1 : 2.2k ohm/4 W
Resistor R2 : 1k2 ohm
Transistor Q1 : 2N3904
IC1 : LS7220
S1-S12 switch : push button
Header
SPDT relay : 12 V
12 V power supply
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Circuit DAILY WAKE UP CALL ALARM CIRCUIT SCHEMATIC DIAGRAM Schematics

DAILY WAKE UP CALL ALARM CIRCUIT SCHEMATIC DIAGRAM

When the sensor doesn’t receive any light (night time), the transistor basis would have 1 (high) value, so the emitor value is 0 (low). The low value in the emitor would reset the IC timer. The circuit’s value would change when the sensor exposed by morning light. This condition would turn on the IC555 and produce sound on the speaker. Sensor sensitivity can be adjusted by turning the variable resistor to find the proper value.

Components :
Resistor R1 : 10k ohm
Resistor R2 : 3K3 ohm
Resistor R3 : 56k ohm
Resistor variable VR1 : 100k ohm
Transistor TR1 : BC158
Polar capacitor C1 : 1uF/15V
Capacitor C2-C3 : 0.01 uF
IC timer : NE555
LDR light sensor
Speaker : 8 ohm/0.5W
ON/OFF switch
9V power supply
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Circuit Water detector circuit for your plant Schematics


Today i want to share with you all my water sensor .This is my second successful project when i started with electronic hobby. This circuit is useful for your plant. How it's work ? simple.. It will beeping when your plant soil is dry and stop when it detect water..that all.. It hard ? Don't worry, it's simple circuit construction. You just need 5 resistors,2 transistors, a LED ,Buzzer and battery of course. Ok let's construct the circuit.

Step 1
Prepare your components
  • Resistor R1,R3 = 1M R2,R5=1K R4= 100 ohm
  • LED
  • Transistor TR1,TR2 - C9013
  • Buzzer
  • 9v Battery Clip
  • Steel rods[or nails] - 2
  • Breadboard
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Circuit Audio Amplifier Using IC LM4780 Schematics

Audio Amplifier Using IC LM4780Audio Amplifier Using IC LM4780

Explore power amplifier integrated circuit from National Semiconductor LM4780. What's so special? Well, first of all - a very low harmonic distortion. In general, manufacturers indicate the maximum power of his ingenious craft regularly with the harmonic content of 10%. At the same chip, CT in the specified maximum power is only 0.5%! Therefore, it is the most honest of all mikruha've found.

The chip implements two identical amplifier channels and features are given for the stereo amplifier. Circuit can also operate in mono - the inclusion of the bridge. In this case, the power output at CT = 0.5% of 120 watts. Other features remain virtually unchanged.

LM4780 IC Fiture
  • Features SPiKe Protection
  • Low external component count
  • Quiet fade-in/out mute mode
  • Wide supply range: 20V - 84V
  • Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W)

Audio Amplifier Using IC LM4780Audio Amplifier Using IC LM4780
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Circuit CHRISTMAS STAR LAMP SCHEMATIC DIAGRAM Schematics

CHRISTMAS STAR LAMP SCHEMATIC DIAGRAM

The lamp will turn on from darkness into its maximum brightness and then goes back to dim. The lamp intensity is influenced by C3 capacitor. IC2 is an optoisolator, and IC1 acts as astable multivibrator. IC1 frequency can be changed by changing the values of R2 and C1.

Components list :

Diode D1-D5 : 1N4007
DIAC : DB3
Resistor R1 : 1k ohm
R2 : 100k ohm
R3-R4 : 10k ohm
R5 : 270k ohm
Resistor variable VR1 : 1M ohm
Polar capacitor C1 : 47uF/25 V
Capacitor C2 : 0.01 uF
Polar capacitor C3 : 470 uF/25 V
Polar capacitor C4 : 0.1 uF/400 V
Transistor SCR : TYN6004,4A,400 V
IC Timer IC1 : ne555
Optoisolator IC2 : MCT2E
Light bulb 220V AC
9V power supply
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Circuit easy and reliable amp Schematics

voice_amplifier_small
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Circuit Headphone monitor amp Schematics


This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1.2" X 1.4") to squeeze into even the smallest spaces and power requirements are so low that existing supplies in retrofitted gear can be used. It's a useful addition to many PAiA products such as the Submixer or Submix-Master. Adding a headphone output turns a Stack-In-a-Box it into an incredible practice amp. 
The key component is the 5532 Dual OpAmp. While ordinarily this part is chosen for it's low noise characteristics, it is also capable of delivering nearly 350mW of output power per side, more than enough to drive headphones. The circuit can operate from bipolar voltages from +/-5V to +/-18V and it is not absolutely necessary that the + and - supply voltages be the same magnitude. The superior supply voltage rejection of the IC allows operation with unregulated supplies.
In the typical mono application such as adding headphones to a FatMan or Theremax, the Left and Right inputs of the amp are both connected to the Volume control supplied with the kit. For stereo applications a dual ganged pot should be used and this modification is covered in the instructions.
The Headphone Buffer amp kit includes circuit board, all electronic components, 1/4" Stereo Jack, Volume control w/knob, wire and assembly instructions.

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Circuit Two Transistors Audio Amplifier Schematics

22 Watt Stereo Amplifier
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Circuit CHRISTMAS FLASHING LIGHT CIRCUIT Schematics

CHRISTMAS FLASHING LIGHT CIRCUIT

Triggering control of the SCR done by Q1, Q2, and related resistors. Timing depends on R1, R2, and C1. If you want to change the frequency, set the C1 value from 100uF to 2200uF instead of modifying the values of R1 and R2, because they already set for the proper current and voltage point. Best performances can be achieved with C1=470 or 1000µF and R4=12K or 10K. A number of 10 to 20 lamp in series for Christmas trees (60mA @ 220V typical for a 20 lamp series-loop) is common, and this low current consumption only need a cheap SCR devices, e.g. C106D1 (400V 3.2A) or TICP106D (400V 2A), and the last, the most recommended is P0102D devices having TO92 case. [Circuit schematic diagram source: ELECTRONICS WORLD "Circuit Ideas", June 2000 issue, page 458].
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Circuit AUTOMATIC TRAFFIC CONTROL LDR SCHEMATIC DIAGRAM Schematics

AUTOMATIC TRAFFIC CONTROL LDR SCHEMATIC DIAGRAM

When the light is dark (high resistance value of LDR), electric current is small. Since the electric current is small and it value less than the transistor’s active voltage, the electric current will be blocked, AC lamp circuit closes, and the light turns on. When the light is bright (low resistance LDR value), electric current is high. Since the electric current is high and its value is larger than the transistor’s active voltage, the electric current passes, relay turn ON position, AC lamp open, and the light turns off.

Components list :
R1 : LDR
Resistor Variable R : 10k ohm
R3, R4 : 1k ohm
Q1, Q2 resistor : 2N2222
Relay K1 : 9V relay type SPDT
L1 : Bulb lamp 220V AC
Fuse F1 1 Ampere
9V power supply
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Circuit AUTOMATIC ROOM LIGHT SCHEMATIC DIAGRAM Schematics

AUTOMATIC ROOM LIGHT SCHEMATIC DIAGRAM

This circuit uses two LDR sensors put separately with 0.5m distance. Make sure to shut the LDR sensor tightly, in order not to be influenced by the light from outside. The output for this circuit is a 220V AC bulb lamp.

Components :
Diode D1-D4 : 1N4001
Diode D5-D8 : 1N4007
Diode D9-D10 : 1N4148
Resistor R1,R3 : 33k ohm
Resistor R2,R4-R8,R10-R13,R15 : 10k ohm
Resistor R9 : 100 ohm
Resistor R14 : 470 ohm
Resistor variable VR1 : 100k ohm
Capacitor C3-C4 : 0.01 uF
Polar capacitor C7,C9 : 1 uF/25 V
Capacitor C8,C10 : 0.1 uF
IC1-IC2 : NE555
IC3-IC4 : CD4017
IC5 : 74LS04
IC6 : 74LS08
Transistor T1-T4 : BC148
Transistor T5 : SL100
Sensor LDR1-LDR2 : LDR
Switch S1 : Push button
Switch S2 : SPDT switch
Relay R7 : 9V 200 ohm
9V power supply
Polar capacitor C1-C2, C5-C6, C11-C12 : 4.7 uF/25 V
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Circuit AUTOMATIC LDR LIGHT SCHEMATIC DIAGRAM Schematics

AUTOMATIC LDR LIGHT SCHEMATIC DIAGRAM
Since the non-inverting reference frequency is higher than the inverting input voltage, the IC ouput value is ’1'. Transistor in ‘ON’ state, relay is also ‘ON’, thus the AC light will be close and the light turns on.

When it’s bright or the resistor value of LDR is low, the current is high. Since the inverting input voltage is higher than the non inverting reference voltage, the IC output is ’0', transistor in ‘OFF’ state, thus the AC open and the light turns off.

Components List :

Resistor R1,R2,R3 : 10k ohm
Resistor R4 : 270k ohm
Resistor R5 : 4k7 ohm
Resistor R6 : 1k ohm
R8 : LDR
Resistor variable R7 : 1M ohm
IC UA741
Diode D1 : 1N4007
5mm LED
Transistor Q1 : BC109
Light bulb
9V relay
9V battery
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Circuit LM2678-5.0 on 5Volt Switching Regulator Schematics

LM2678-5.0 on 5Volt Switching RegulatorLM2678-5.0 on 5Volt Switching Regulator
This is the circuit diagram of a 5V power regulator based on LM2678 IC. The LM2678 series of regulators are monolithic integrated circuits that provide all the necessary functions required for a switching regulator money and can handle loads up to 5A. The IC has more than 90% efficiency and has to load and line regulation. The LM2678 is available in three fixed output voltages (3.3 V, 5V, 12V) and an adjustable output version. The IC is also filled with a bunch of l features such as thermal shutdown, current limiting and power on / off.

Note:
  • The circuit given here is based on the version LM2678-5.0 which gives an output of 5V.
  • The power supply for the circuit can be anything between 8 to 40V DC.
  • The feedback wiring must be placed as away as possible from the inductor L1.
  • Do not use loads that consume more than 5A.
  • A heat sink is seriously recommended for the IC.
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Circuit AUDIO FREQUENCY LIGHT MODULATOR SCHEMATIC DIAGRAM Schematics

AUDIO FREQUENCY LIGHT MODULATOR SCHEMATIC DIAGRAM
The distance between receiver and transmitter circuit depends on the environment. Light has function to replace cable from audio source to speaker. Transformer X2 is utilized to lock the audio signal. VR1 works as the amplitudo modulator from the T1 signal output.

Parts list :

Resistor R1: 47k ohm
Resistor R2 : 22k ohm
Resistor R3 : 220 ohm
Diode D1-D7 : 1N4001
VR1 : 1k ohm
Polar capacitor C1 : 470 uF/25V
Polar capacitor C2 : 1 uF
Capacitor C3 : 0.1 uF
Transistor T1-T2 : BC148
Transformer X1 : 220 V AC/0-12V AC
X2 : AF output
Transistor SCR1-SCR2 : BA654
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Circuit ping pong circuit schematic Schematics


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Circuit Audio Surround Decoder circuit diagram Schematics

Audio Surround Decoder circuit diagram
This circuit has been created to design a decoder circuit that will function in a module that produces surround sound audio.

The operation of the circuit starts up and transport the stereo surround sound signal quality information on the master volume circuit. This will drive the left channel connected to LCH Model TL072 IC1A IC1B and attached to the right channel Rch. The outputs of these operational amplifiers serve as the input buffer for the next stages of the circuit. IC2C is responsible for the sum of the signals from left and right to power the center speaker output, while IC2D is responsible for increasing the phase difference between left and right, which is encoded in the two channels and be fed to the rear speakers. It is necessary to ensure that the negative terminals from the rear speakers is not grounded, since it will only work in parallel with the main speakers.



The output of the power unit regulated IC2D takes audio to rear speakers. This would lead to the creation of sense of separation, according to the size of the room. This will incorporate signal amplifier IC5 MN3004 sound delay that has 512 steps. From IC4 MN3101 is a timing signal, which provides synchronization of IC5 as it functions as an oscillator in the circuit. C17 variable capacitor regulates the delay in the circuit. The presence of filters in the circuit is in order to avoid the noise that occurs during the process.

These filters can be adjusted to cut the frequencies above 8 kHz and below 100 Hz, to be able to drive the rear speaker. The rear speaker is small and that their entry is encoded with a bandwidth of 100 Hz to 8 KHz. The filters are built around the IC6A / B is also an output buffer. A potentiometer is placed on each output to aid in the adjustment and regulation of speakers and amplifiers. The energy supplied in the circuit is 15 V and each output can drive a single power amplifier.

List Compoment
R1-2-7-8-12-13-18-19-20 : 47Kohm
R3-4-5-6-21-22-34-35 : 10Kohm
R9-10-11-14-15-16-17 : 15Kohm
R23-24-25-33-36 : 100ohm
R26-27-28-31-32 : 100Kohm
R29-30 : 5.6Kohm
C1-8 : 47uF/25V
C2-7-9-14-23 : 47nF
C3-6 : 1uF/100V
C4-5-10 : 33pF
C11-12-15 : 10uF/25V
C13 : 82nF
C16 : 18pF
C17 : 100pF mini adjustable capacitor
C18 : 2.2nF
C19 : 4.7uF/25V
C20 : 100nF
C21 : 10nF
C22 : 180pF
C24 : 150nF
RV1-RV2 : 2 X 10Kohm Log. pot.
RV3-4 : 10K Log pot.
D1 : 1N4148
IC1-6 : TL072
IC2-3 : TL074
IC4 : MN3101
IC5 : MN3004

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Circuit METAL DETECTOR SCHEMATIC USING BEAT FREQUENCY OSCILLATOR CIRCUIT DIAGRAM Schematics

METAL DETECTOR SCHEMATIC USING BEAT FREQUENCY OSCILLATOR CIRCUIT DIAGRAM

Schematic Diagram of The Metal Detector Circuit,
Metal detecting with beat frequency oscillator is one of the simplest method. The circuit basically have two balanced oscillators. The first provides the reference signal, and the other acts as the detector element. The frequency for the reference is fix, and the other one varies depending on the presence of a metal. This reference oscillator can be built using various circuit topology : LC (inductor-capacitor), RC (resistor-capacitor), or quartz oscillator. The detector oscillator uses LC because the mechanism will use the magnetic induction property of the detected object, and the inductor component will detect the probe.

The NAND gates use CMOS 4011 chip, a low power component that is suitable for this battery-operated circuit. You can see that this chip is supplied by a 5V voltage coming from an LM7805L regulator. You might wonder what the purpose of this regulation is, since the power supply come from a 9V battery and the CMOS gates can handle the voltage of 3-15 Volt. The main purpose of the regulator is to keep a constant voltage source for the reference oscillator frequency stability, since the frequency is affected by the power supply voltage variation as the battery voltage drops in the long time of usage.

This circuit uses parts as follows :

U1: CD4011
U2: LM389
U3: 78L05
R1: 2.2k 5%
P2: 4.7k lin.
R3: 330k 5%
R4: 270k 5%
R5: 1k 5%
C1: 390pF (NPO)
C2,C3,C4: 10nF
C5: 10uF 16v electrolytic
C6,C8: 220 uF 16v electrolytic
C7: 100uf 16v electrolytic
C9: 100nF ceramic
P1: 4.7k log
L1: 22cm in diameter with 14 turns AWG 26
K1: SPDT toggle switch
J1= Headphone jack 1/4 or 1/8 inch
Other parts: 9v battery connector, speaker or headphones
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Circuit SCANTOOL OBD-II INTREPRETER MODULE Schematics

ScanTool OBD-II Intrepreter Module in a DIP-24 Package
microOBD 200 (#440101) is a complete OBD?II interface in a vibration-resistant DIP-24 module. The only product of its kind, it offers engineers a simple and inexpensive way to add OBD-II support to any embedded project and tap into the wealth of information available on the vehicle’s communication bus. The interface is fully compatible with the popular ELM327 command set and supports all legislated OBD-II communication protocols, as well as the heavy-duty SAE J1939. It features automatic protocol detection, a large memory buffer, a UART interface capable of speeds of up to 10 Mbps, and a bootloader for easy firmware updates. The microOBD draws less than 1 mA in Standby mode, which makes it suitable for permanent in-vehicle installations. The host can force the module to enter the lowpower state by sending it an explicit “sleep” command or pulling the digital “host present” pin low. The module can also put itself in Standby automatically on UART inactivity or by sensing that the engine is off. Typical applications include diagnostic scan tools, code readers, data loggers, digital dashboards, fleet management, and vehicle tracking.
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Circuit POWER INTEGRATION ICS AUTOMATIC AND SAFETY Schematics

Power Integration ICs Automatically and Safely Discharge X Capacitors

CAPZero acts as a smart high-voltage switch when placed in series with discharge resistors. When AC voltage is applied, CAPZero blocks current flow in the X capacitor safety discharge resistors, reducing the power wasted in these components to zero at 230 VAC. When the AC voltage is disconnected, CAPZero automatically and safely discharges the X capacitor by closing the circuit through the bleed resistors and directing the energy away from the exposed AC plug. This approach provides engineers with total flexibility in their choice of the X capacitor used to optimize differential- mode EMI filtering without worrying about the effect of the required bleed resistors on system no-load and standby power budget. The innovative design inherently meets international safety standards for all open and short-circuit fault tests, allowing CAPZero to be used before or after the system input fuse. CAPZero is suitable for all AC-DC converters with X capacitors that require very low standby power. It’s offered with 825- or 1,000-V MOSFETs to support a variety of power supply design needs. It is ideal for a wide range of applications, including PCs, servers/workstations, monitors and TVs, printers and notebooks, and appliances requiring EuP Lot 6 compliance and adapters requiring ultra-low no-load consumption. CAPZero devices are available now in an SO-8 package at $0.40 each for 10,000- piece quantities. [www.powerint.com]
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Circuit POWER CONVERTER TOPOLOGY AND MOSFET SELECTION FOR 48V TELECOM APPLICATIONS SCHEMATIC Schematics

POWER CONVERTER TOPOLOGY AND MOSFET SELECTION FOR 48V TELECOM APPLICATIONS SCHEMATIC
A typical specification can range from a low of 36V to a high of 72- with a 48-V nominal. In some designs, transients in excess of 100V need to be considered. Most of these designs will require input to output isolation of up to 1500V.

Output voltages are frequently 5V and below with 3.3V probably the most common requirement, and 2.5V gaining in popularity. If a processor is on the card, voltages as low as 1.3V are not unlikely. One common approach is to regulate a distributed power bus, say the 5V rail, and then use non-isolated DC/DC converters to generate lower voltages. With the tendency away from 5V, the 3.3V rail is beginning to serve as the distributed bus, although, from the power supply designer’s perspective, this is not the most of desirable situations.

Fairchild has recently introduced a family of high voltage MOSFETs ranging from 80- to 200-V drain voltage specifications. This application note will provide information helpful in the proper selection of FETs for primary side switches – available in various types of 48V power converters.
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Circuit PHONE BROADCASTER CIRCUIT SCHEMATIC DIAGRAM Schematics

PHONE BROADCASTER CIRCUIT SCHEMATIC DIAGRAM

circuit diagram of phone broadcaster is useful to hear the conversation between persons who use the telephone. This circuit doesn’t need additional power supply, as it is only need the power from the telephone line. The circuit has two sections, the automatic switching, and the FM transmitter.

The automatic switching consists of resistors R1-R3, variable resistor VR1 as the regulator, transistor T1 and T2, zener diode D2, and diode D1. R1 and VR1 is useful as an input voltage divider from the telephone line.

Parts list :

Resistor R1-R2, R4 : 47k ohm
Resistor R3 : 100 ohm
Resistor R5 : 22k ohm
Resistor R6 : 1M ohm
VR1 : 100k ohm
Diode D1 : 1N4001
Zener diode D2 : 24V, 400mA
Capacitor C1 : o.o1 uF
Capacitor C2 : 330 pF
Trimmer C3 : 50p
Capacitor C4 : 5.6 pF
Capacitor C5 : 10 pF
Transistor T1-T2 : BC548
Transistor T3 : BF494
Inductor L1 : 45rotation 36SWG in resistor carbon 1M 1W
Inductor L2 : 3 rotation 21 SWG 12mm diameter
Antenna
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Circuit MOUSE REPELLENT CIRCUIT SCHEMATIC DIAGRAM Schematics

MOUSE REPELLENT CIRCUIT SCHEMATIC DIAGRAM

It uses IC timer NE555. When the circuit at its close state, the IC will control the buzzer time using the resistor and capacitor. The buzzer sounds like alarm in the different frequencies.

Resistor R1 : 1.8k ohm
Resistor R2 : 1k ohm
Resistor R3 : 5.6k ohm
Resistor R4 : 480 ohm
Capacitor C1 : 2.2 nF
Polar Capacitor C2 : 0.022uF/6V
IC1 timer : NE555
Speaker SP1 : Tweeter 8 ohm
Power supply : 5V
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Circuit MOSQUITO REPELLENT CIRCUIT SCHEMATIC DIAGRAM Schematics

MOSQUITO REPELLENT CIRCUIT SCHEMATIC DIAGRAM

mosquitos coming to you. It uses IC CD4047 to control the buzzer timing utilizing resistor and capacitor. When the voltage passing through the transistor, the buzzer would sound.

Variable resistor R1 : 10K ohm
Polar capacitor C2 : 4.7 nF/16V
Capacitor C3 : 22uF
IC1 : CD4047
NPN transistor Q1-Q2 BC547
PNP transistor Q3-Q4 BC557
Buzzer K1 : Tweeter 8 ohm
Power supply : 12V
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Circuit 12 Volt car Battery Monitor Circuit Schematics

12 Volt car Battery Monitor Circuit12 Volt car Battery Monitor Circuit

This circuit can be used to monitor the voltage level of a car battery. When the battery voltage is 11.5V or less the transistor Q1 is on and D1 glowing.When LED battery voltage is between 11.5 to 13.5 V, the transistor Q2 is on and the glowing LED D2 .

When the battery voltage is above 13.5 V, the transistor Q3 is on and the LED D3 will be bright. The 12 volt control can be connected between terminals A and B and for the convenience of using LEDs of different colors.

List component of Monitor status battery 12 volt
-R1,R3,R6: 1k 1/4W Resistance
-R2: 100K 1/4W Resistance
-R4,R5,R7,R8: 3.3K 1/4W Resistance
-D1: LED red color
-D2: LED yellow color
-d7: LED green COLOR
-D2,D4,D5,D8,D9: 1N4148 diode 1 ampere
-D6: BZX79C10 diode Zener 10 volt
-D10: BZX79C12 diode Zener 12 volt
-Q1,Q2: BC547 NPN transistor
-Q3: BC557 PNP transistor
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Circuit CAR EXTERIOR LIGHTS CIRCUIT DIAGRAM Schematics

Mitsubishi Montero Exterior Lights Circuit Schematic Diagram

Mitsubishi Montero 1994 is shown in the following figure. It shows the connection and wiring between each parts and component of exterior lights system of the vehicle such as the fusible link, junction block, tail light relay, cruise control, stop light switch, relay box, column switch, rear combination light, front combination light, license light, hazard light switch, turn-signal and hazard flasher unit, park/neutral position switch, back-up light switch, combination meter, and many more.
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Circuit MINI AUDIO AMPLIFIER SCHEMATIC DIAGRAM Schematics

MINI AUDIO AMPLIFIER SCHEMATIC DIAGRAM
“mini” audio amplifier referring to its small dimension and small output. It is intended for earpiece/earphone use. The characteristics are consume power less than 3mA, using push-pull output which can drive the earpiece to very loud level when audio is detected, whole circuit DC coupled, therefore makes it difficult to set up. Due to its size, be careful when assemble the circuit.

The 8k2 across the 47u sets the emitter voltage on the BC 547 and this turns it on. The collector is directly connected to the base of a BC 557, called the driver transistor. Both these transistors are now turned on and the output of the BC 557 causes current to flow through the 1k and 470R resistors so that the voltage developed across each resistor turns on the two output transistors. The end result is mid-rail voltage on the join of the two emitters. The two most critical components are 8k2 between the emitter of the first transistor and 0v rail and the 470R resistor.
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Circuit LOW NOISE WHITE LED DRIVER SYSTEM SCHEMATIC DIAGRAM Schematics

LOW NOISE WHITE LED DRIVER SYSTEM SCHEMATIC DIAGRAM

LM3570 is a parallel white LED driver capable of running directly off of a lithium-ion battery. The LM3570 has three parallel white-led drivers and a regulated VOUT pin (4.35V) capable of driving keypad or caller id display (CLI) diodes through the use of ballast resistors. The LM3570 evaluation board has a chip enable pin (active high logic) as well as a PWM (active high logic) pin which allows current sources to be turned on and off without completely disabling the part..The LM3570 is capable of supplying up to 80mA of current split between the regulated current sources and VOUT. The LM3570 comes in National’s LLP-14 package.
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Circuit DIGITAL THERMOMETER CIRCUITS - PIC16F84 Schematics

DIGITAL THERMOMETER CIRCUITS - PIC16F84

This electronic project is a very simple thermometer that is based on the PIC16F84A microcontroller, designed by Microchip.
Why to use a thermometer that is designed using a microcontroller and not a classic analog thermometer? Because you can design a complex solution using few external components, resulting an low cost application that provide a high precision measurement .
This Digital thermometer microcontroller project use watchdog timer function to measure temperature. The WDT on all PIC-micro microcontrollers has a nominal time-out period of 18 ms. The WDT time-out period varies with temperature, VDD and part-to-part process variations.
READ MORE: http://kitaudio.blogspot.com/2011/04/digital-thermometer-with-pic16f84.html
THIS IS THE PICTURE BELONGS TO THE WEBSITE: http://kitaudio.blogspot.com/
WEBSITE: AUDIO KIT AMPLIFIER CIRCUIT DIAGRAMS
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Circuit Mini-MosFet Audio Amplifier Schematics

Notes
This project was a sort of challenge: designing an audio amplifier capable of delivering a decent output power with a minimum parts count, without sacrificing quality.
The Power Amplifier section employs only three transistors and a handful of resistors and capacitors in a shunt feedback configuration but can deliver more than 18W into 8 Ohm with <0.08% THD @ 1KHz at the onset of clipping (0.04% @ 1W - 1KHz and 0.02% @ 1W - 10KHz) and up to 30W into a 4 Ohm load.
To obtain such a performance and to ensure overall stability of this very simple circuitry, a suitable regulated dc power supply is mandatory. This is not a snag because it also helps in keeping noise and hum of the preamp to very low levels and guarantees a predictable output power into different load impedances. Finally, as the amplifier requires only a single rail supply, a very good dc voltage regulator capable of supplying more than 2 Amps @ 40V can be implemented with a few parts also.




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