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Simple Microphone (MIC) Amplifier Circuits
https://makingcircuits.com/blog/simple-microphone-mic-amplifier-circuits-using-transistors/#:~:text=The%20two%20transistor%20MIC%20amplifier%20circuit%20is%20isolated,the%20sound%20%28audio%29%20signal%20directly%20into%20electrical%20impulses.
Sensitive Audio Detector | AC Circuits | Electronics Textbook
https://www.allaboutcircuits.com/textbook/experiments/chpt-4/sensitive-audio-detector/
Detectors are intended to be used for balancing bridge measurement circuits, potentiometric (null-balance) voltmeter circuits, and detect extremely low-amplitude AC (“alternating current”) signals in the audio frequency range. It is a valuable piece of test equipment, especially for the low-budget experimenter without an oscilloscope.
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.
Auto power-on signal sensing circuit | diyAudio
https://www.diyaudio.com/community/threads/auto-power-on-signal-sensing-circuit.96784/
Auto power-on signal sensing circuit. Thread starter Slanski62; Start date 2007-02-21 11:18 pm; S. Slanski62 Member. 2006-10-22 12:59 am. 2007-02-21 11:18 pm #1 ... because audio is bipolar and the Arduinio inputs are unipolar you will need to couple the audio signal into a 2.5V level (or similar) "ground" reference within the 0-5V range of the ...
ON COMPRESSIVE SENSING IN AUDIO SIGNALS
http://www.multimedia.ac.me/papers/on%20cs%20in%20audio%20signals.pdf
ON COMPRESSIVE SENSING IN AUDIO SIGNALS Irena Orović, Srdjan Stanković, Branka Jokanovi ć, Andjela Dragani ć, [email protected] University of Montenegro, Faculty of Electrical Engineering Abstract – The reconstruction of musical audio signal by using the Compressive Sensing technique is presented in the paper.
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.
Audio Signal Strength Detector/Converter – Simple Circuit ...
https://www.simplecircuitdiagram.com/2265-audio-signal-strength-detectorconverter/
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 this circuit is audio level meter. Other application such as sound-controlled light circuit can be implemented with this circuit as well.
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