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Audio Signal Detector/Switch Circuit - DiscoverCircuits.com
http://www.discovercircuits.com/H-Corner/audiosignal%20detector%20switch.htm
The hobby circuit below will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal. The switch could be used to turn on a relay, routing the signal to where it is needed. A single 3v lithium cell will power the electronic circuit for about 5 years.
Stereo Audio Switch Circuit - ElectroSchematics.com
https://www.electroschematics.com/stereo-switch/
switch This stereo audio switch circuit allows that with only one switch to select one of the four stereo channels. The internal switching is made posible with CMOS components. Each switch input includes a voltage divider to allow the switch to work in the linear zone of the characteristics, this ensures low audio signal distorsions.
Audio Switch Notes - Neat Circuits
https://www.neatcircuits.com/audiosw/index.html
The circuit below is an example of a simple audio switch: Values are not critical so experiment for best results. 2N2222 or any signal NPN transistor is used to invert the control logic if required. Note there is no power required This voltage can be from +5 to +15 volts. The circuit should mute sufficiently any audio from 15 hz to 20 khz.
Audio Signal Switcher | Circuit Digest
https://circuitdigest.com/forums/analog-electronics/audio-signal-switcher
Hey, I'm new here (and new to electronics in general). I'm trying to use a 555 timer to build a circuit that redirects an audio signal into 1 or 2 paths. (For now, let's say left/right speaker.) I've already been able to build a circuit that alternates between 2 LED's. Think of this circuit, but when one LED blinks, the audio signal goes left, and when the other blinks, the
Circuit: Audio Signal Detector Switch__ Circuit designed ...
http://discovercircuits.com/DJ-Circuits/audiodetect1.htm
Audio Signal Detector Switch This circuit will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal. It could be used to turn on a relay, routing the signal to were it is needed. Click on Drawing Below to view PDF version of Schematic More
Audio Switcher (Arduino) : 5 Steps - Instructables
https://www.instructables.com/Audio-Switcher-Arduino/
As the pin header is not that interesting we'll move on to the 4052 chip. This chip is a dual analog switcher and as the name implies it switches the audio signal from on of it's four inputs and directs it to the one output. Because most of the time audio is stereo we need two audio switchers. this is where the "dual" comes in handy.
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