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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
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
Sine Systems, Inc. | DIY Audio Detection Circuit
https://sinesystems.com/support/rfc1/rfc1_diy_audiodetect.shtml
The easiest way to set this up to detect loss of audio with the RFC-1/B is to connect the output of this circuit to a telemetry input and turn the calibration pot fully on (clockwise). Then set the upper limit for this channel to 9999 and the lower limit to around 0150. With audio present the channel will read "status on" most of the time.
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 Signal Strength Detector/Converter – Simple Circuit ...
https://www.simplecircuitdiagram.com/2265-audio-signal-strength-detectorconverter/
Audio Signal Strength Detector/Converter January 10, 2011 Rust Below is the schematic diagram of an audio input module. We can produce a DC output voltage that is proportional to the input signal amplitude (the signal strength) using this circuit. One application of …
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