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Audio Optocouplers - Learn About Electronics
https://www.learnabout-electronics.org/Semiconductors/opto_53.php
Basic Audio Optocoupler. The circuit shown in Fig. 5.3.4, adapted from a design in Newnes Electronic Circuits Pocket Book by Ray Marston (ISBN 10:1-4832-9192-8) uses the 4N25 connected as a phototransistor to pass audio signals whilst isolating the input and output circuits. An LM324 op amp is used here to drive the LED input of the 4N25.
Audio-Optical Isolation Amp | audioXpress
https://audioxpress.com/article/Audio-Optical-Isolation-Amp
The Applied Optocoupler In this audio frequency application, I have chosen the IL300 linear optocoupler, which consists of an IRLED that is irradiating an isolated feedback and an output PIN photodiode in a bifurcated arrangement. The feedback photodiode captures a percentage of the LED’s flux and generates a control signal that can be used ...
G15396 - Audio Opto Coupler
https://www.goldmine-elec-products.com/prodinfo.asp?number=G15396
Tiny audio optocoupler is about the size of a pencil eraser and has 4 leads. These are used extensively in audio compressors, audio level controls, audio limiters, expanders/noise gates, guitar tremolo effects, guitar amplifiers and music effect boxes. Inside the black epoxy case is a 2 lead CDS cell (not a photodiode or photo-transistor) and a ...
Audio Optocoupler? | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-optocoupler.102434/
9,484. Oct 16, 2014. #11. Crutschow's circuit is fairly linear because it uses a standard optocoupler with an LED and a photo transistor, and both halves share the same device physics. The Silonex part has a photo resistor, not a phototransistor, and …
Optocoupler Circuits | Nuts & Volts Magazine
https://www.nutsvolts.com/magazine/article/optocoupler-circuits
An optocoupler can be used to interface analog signals from one circuit to another by setting up a standing current through the LED and then modulating this current with the analog signal. Figure 17 shows this technique used to make an audio-coupling circuit.
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