Schematics Sound Level Meter with LM3915 | Electronic Circuits

Schematics Sound Level Meter with LM3915

Here's a nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components. This audio meter circuit can also be integrated into audio amp projects.



Note:
  • V+ can be anywhere from 3V to 20V.
  • The input is designed for standard audio line voltage (1V P-P) and has a maximum input voltage of 1.3V.
  • Pin 9 can be disconnected from +V to make the circuit use a moving dot display instead of a bar graph display.

Source: Sound Level Meter

Continue reading : R-2R Digital to Analog Converter

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