[BC] Wanted - Subaudible Tone Decoder Suggestions

[Justin Kaiser - Voiceovers and Internet Marketing]

I'm actually looking for 25 and 35.  I need to decode 2 tones.  I'm still
learning but not that far ahead of the game. 

Justin
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That may not work as what he is looking for is probably 25 Hz.  I have put
together tone decoders using a 741 opamp driving an NPN transistor which
then pulls a relay to ground.  If someone has the time, it's not too hard to
do.