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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.
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-Optical Isolation Amp | audioXpress
https://audioxpress.com/article/Audio-Optical-Isolation-Amp
Audio-Optical Isolation Amp. August 20 2015, 05:00. When we connect audio components, interference may occur from various power and signal grounds. This circuit enables the full galvanic isolation of sound frequency signals with optical transmission in excellent quality, eliminating interference. This article was originally published in ...
Optocouplers - Homemade Circuit Projects
https://www.homemade-circuits.com/optocouplers-working-characteristics-interfacing-application-circuits/
An optocoupler can be also effectively used for interfacing analog signals across two circuit stages by determining a threshold current through the IRED and subsequently modulating it with the applied analog signal. The following figure shows how this technique may be applied for coupling an analogue audio signal.
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 …
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.
What Is Optocoupler, Opto-coupler Working And Uses ...
https://circuitspedia.com/optocoupler-opto-coupler-opto-isolator-working-and-uses/
Opto-coupler is an electronic component that is used to conduct the electrical signals from one circuit to another circuit without directly connected between them. In other words, an optocoupler is used to transfer electrical signals between two circuits optically. Here both circuit is electrically isolated from each other.
Optocoupler or Optoisolator for Audio | Forum for Electronics
https://www.edaboard.com/threads/optocoupler-or-optoisolator-for-audio.58629/
audio opto isolator Hi, We have two channel audio to be seperated from the final stage audio amplifier. Now becase of different products the final power ampifier keeps on changing and we come across gounding loop/ humming noise. I know that optocoupler could be used to eliminate this. Does any one knows any good one for audio (analog). I am ...
opto isolator - Audio soft mute using optically isolated ...
https://electronics.stackexchange.com/questions/325777/audio-soft-mute-using-optically-isolated-mosfet
simulate this circuit – Schematic created using CircuitLab. Figure 1. (a) The (presumed) existing circuit. (b) The modified circuit. Instead of shorting to ground you could short to the DC offset. R3 and C4 provide a low-pass filter and the voltage on C4 will be DC and, effectively, audio ground.
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