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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.
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. FIGURE 17. …
Audio Optocoupler? - All About Circuits
https://forum.allaboutcircuits.com/threads/audio-optocoupler.102434/
Below is a circuit using a single, standard opto coupler to generate a linear transfer function. The trick is that it uses a current, not a voltage drive to the opto, since the current transfer ratio of an opto coupler is fairly constant over a practical current range.
Linear Optocoupler Circuit - ElectroSchematics.com
https://www.electroschematics.com/linear-optocoupler-circuit/
This linear optocoupler is built with MOC5010 and can be used to isolate a circuit from main grid, audio interface, in medical electronics and many other applications. Because of its high isolation resistance (10 11 Ω), MOC5010 is used in applications where a circuit is powered directly from main power.
Audio level control with resistive optocouplers.
https://tortugaaudio.com/documents/docs/Silonex%20Optocouplers%20Application%20Notes.pdf
Audio level control with resistive optocouplers. Introduction Controlling the level of an audio signal by means of an applied voltage or current has always been somewhat problematical but often desirable, particularly when it is necessary to control a circuit from a computer.
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