hi,
do anyone has suggestion for me to built a audio detector cct whereby the cct will produce a dc voltage at presence of audio and 0V wen no audio detected over tht line....
you can use LM324 to construct a AC couple amplifier,
then rectify the output signal use a 1N4148 diode,
and filter the retified waveform use a parallel
RC network.
best regards
danesh said:
hi,
do anyone has suggestion for me to built a audio detector cct whereby the cct will produce a dc voltage at presence of audio and 0V wen no audio detected over tht line....