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Circuit-Audio Signal Detector/SwitchHobby Corner
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.
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.
Audio Detector Switch - EasyEDA
https://easyeda.com/guest/Audio_Detector_Switch-yYuM4mfxP
Description. 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 stopped.
Audio Signal Switch - Switch - AliExpress
https://www.aliexpress.com/popular/audio-signal-switch.html
video signal switch. z800 signal switch. led relay turn signal suzuki. genki audio switch. audio signal switch passive. UGREEN Switch Bluetooth 5.0 Audio 3.5mm Transmitter Adapter for Receiver Nintendo Switch APTX LL Wireless Transmitter. US $19.98. 134 sold. 4.8.
Audio Line Level Signal Detection "Auto On-Off Mains ...
https://www.jlelectronicsph.com/product/blank-pcb-for-audio-line-level-signal-detect-auto-on-off-mains-switch
Audio Line Level Signal Detection "Auto On-Off Mains Switch" Blank PCB 2pcs. $ 6.00 USD - $ 18.00 USD. Switches-on the relay when it detects an audio signal, and when the audio signal is lost, it switches off after a preset time delay. Preset delay and signal sensitivity are adjustable through trimmer. Specifications. Supply Voltage: 12V DC or AC.
A design guide for implementing audio signal detection ...
https://www.ednasia.com/a-design-guide-for-implementing-audio-signal-detection/
Audio detector design. The article describes the design of an audio detector with the programmable mixed-signal chip SLG47502. The proposed method is based on the changing frequency of an audio signal. If the frequency of the input signal changes a certain number of times, then the device identifies this signal as audio.
A design guide for implementing audio signal detection
https://www.planetanalog.com/a-design-guide-for-implementing-audio-signal-detection/
A design guide for implementing audio signal detection. Sound can be represented with both analog or digital audio signals. Analog audio signals use electrical voltage levels. Different types of transducers convert sound to electrical signals and electrical signals to sound. The audio signal frequency range is roughly 20 Hz to 20,000 Hz.
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 ...
arduino - How to detect line level audio signal ...
https://electronics.stackexchange.com/questions/64099/how-to-detect-line-level-audio-signal
The switching itself seems fairly straightforward (a pair of de/multiplexers), but I don't know how to detect the audio signal, it should also not interfere with the signal itself. The switch box will be controlled by an Arduino or something similar, as it needs to have some kind of timer so that it wont switch back and forth randomly if there are multiple inputs active.
3 Sound activated switch and Detector Circuit with PCB ...
https://www.eleccircuit.com/sound-activated-switch-circuit/
Figure 1 is the circuit diagram. The circuit use Mic1 is a condenser microphone, when it gets the sound make the voltage across changing as AC signal and amplified by LM324 op-amp and show the sound with LED1 at the output. Figure 2 the PCB layout. Figure 3 The component layout. The single power supply voltage is 5V-12V.
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