Miscellaneous Audio Circuits
Mic Level Echo Canceller
2-input Audio Mixer
Phone Clip Amplifier
Telephone Recorder Controller
Adjustable Pass Filter
C-Beeper
Mini Metronome
Electronic Metronome
DTMF Decoder 1
DTMF Decoder 2
Mic/Line Mixer for PC Sound Card
Simple 4-input Mixer
Mixer Channel Amp
2-input Audio Mixer
FET-input Audio Stage
Audio Exciter Driver
Audio Milli-Volt Meter
Audio VU Meter
Induction Pickup Amp
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