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)
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.
audio fed to the ADC pin of ATmega32A
aaded voltage regulator (2sc1383 + 5V6 zener), we can also use LM7805 regulator.