volume indicator

Volume indicator Indicates the level of audio signal.(this project is under construction.. will update soon )

INPUT devices: microphone                                                                                                         OUTPUT: LED bar graph                                                                                                               processing: AVR (ATmega32A)

My construction:

volume unit meter version1

 

microphone pickup’s the audio signal and BC546 preamp amplifies the signal to the level 1.8Vpp max, so that ADC can read.  BC546 collector feedback bias circuit.

ckt.jpg

 

audio fed to the ADC pin of ATmega32A

aaded voltage regulator (2sc1383 + 5V6 zener), we can also use LM7805 regulator.

volume indicatorpic1.jpg

 

 

 

 

 

3 thoughts on “volume indicator

Add yours

    1. Small low powered/battery powered amp are good for intercom’s, I will post intercom project very soon, as it’s on my list.
      Thank you sir for your comment and sorry for late reply.

      Like

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