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Audio Detector Switch - EasyEDA
https://easyeda.com/guest/Audio_Detector_Switch-yYuM4mfxP
Two similar circuits: A) Automatic input selector: If input A is connected to the output, if input B has audio signal the circuit switches to input B. B) Detect audio signal to switch relay on and after some time off again when the music has …
Circuit-Audio Signal Detector/SwitchHobby Corner
http://www.discovercircuits.com/H-Corner/audiosignal%20detector%20switch.htm
Audio Signal Detector/Switch Circuit designed by David A. Johnson, P.E. For some audio systems it is desirable to have an automatic switch circuit turn on other devices, such as an Amplifier, if an audio signal is detected on one line. The hobby circuit below will activate a
3 Sound activated switch and Detector Circuit with PCB ...
https://www.eleccircuit.com/sound-activated-switch-circuit/
Simple Sound detector circuit using LM324. Today Kunal Banerjee send this project to me. It is a simple Sound detector circuit using LM324. He said ”DEAR SIR, TODAY I HAVE MADE A SOUND DETECTOR CIRCUIT, AND ITS WORKING VERY GOOD AS ITS CAPACITY TO CATCH THE AUDIO IS TOO HIGH AND EASILY DETECT THE SOUND AND THEN IT WORKS. …
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 Detector Switch | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-detector-switch.76451/
I chose the 2 diode detector simply to get a bit more DC to switch with from the 4V or so P'P zener limited audio. I resurrected the design recently as a 'Silence' detector for another Community Radio station, using it 'backwards' with fast attack and 15 or so sec hang, to switch in a backup Player doodad when the station automation fails, or a ...
Simple Sound Detection Circuit. Detecting Sound
https://picaxe.com/docs/picaxe_sound.pdf
means the circuit could also be used, for example, to switch a FET on for a period of time to drive a motor (e.g. in a shop display system). Sound Detection Circuit ELECTRET MICROPHONE R1 4k7 R3 100k R5 220k R6 100R R7 4k7 R8 10k Q1 BC548B Q3 BC548B Q2 BC558B C1 470n C2 1n0 C3 470n D1 1N4148 C4 470n RV1 4k7 SENSITIVITY RV2 47k SET ZERO + 4.5 V 0 V
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.
detection - How does an audio jack detect when a speaker ...
https://electronics.stackexchange.com/questions/1647/how-does-an-audio-jack-detect-when-a-speaker-is-plugged-in
This cross-drive impedance sensing circuit, which is electrically coupled to the left and right audio ports and the left and right amplifiers, detects the resistances of left and right output loads in order to determine characteristics of a device connected to the CODEC audio jack.
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