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Audio Optocouplers - Learn About Electronics
https://www.learnabout-electronics.org/Semiconductors/opto_53.php
Method 1. 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. R1 and R2 form a potential …
Optocoupler Circuits | Nuts & Volts Magazine
https://www.nutsvolts.com/magazine/article/optocoupler-circuits
On the output side of the optocoupler, a quiescent current is set up (by the optocoupler action) in the phototransistor, and causes a quiescent voltage to be set up across RV1, which should have its value adjusted to give a quiescent output value of half-supply voltage. The audio output signal appears across RV1 and is DC-decoupled via C2.
switches - Can an optocoupler be used as a switch ...
https://electronics.stackexchange.com/questions/425047/can-an-optocoupler-be-used-as-a-switch
The output of a "normal" optocoupler is an NPN transistor. It is very good at switching a low current DC voltage. It is not very good at switching an AC signal such as audio. There are optocouplers with MOSFET and TRIAC outputs that are …
optocoupler 6N138 as a switch - General Electronics ...
https://forum.arduino.cc/t/optocoupler-6n138-as-a-switch/59921
hi there! I aim to build an audio switch controled by a pulse out from arduino, and i was wondering if it was possible to use an optocoupler for this porpouse. Since i have some 6N138 this would be the ideal option. Is this possible with good results? If anyone knows of a good schematic for this, let me know. I don't want to use cd4066 cmos chips since they will put …
Optocoupler Switch - MOD WIGGLER
https://modwiggler.com/forum/viewtopic.php?t=221638
Optocoupler Switch Post by cackland » Tue Sep 10, 2019 12:02 am I'm currently prototyping an audio switch circuit, with the same characteristics as a Vactrol switch, however wanting more of a smaller compact design.
Audio Optocoupler? - All About Circuits
https://forum.allaboutcircuits.com/threads/audio-optocoupler.102434/
Optocouplers can be a bit slow - maybe even for audio frequencies, so worth checking that detail on the data sheet before going ahead. Photo diode couplers are faster than photo transistor ones. If all you need is speech bandwidth, you shouldn't have much trouble. AnalogKid Joined Aug 1, 2013 9,484 Oct 16, 2014 #11
What Is Optocoupler, Opto-coupler Working And Uses ...
https://circuitspedia.com/optocoupler-opto-coupler-opto-isolator-working-and-uses/
In this, you can switch ON or Switch OFF A 220V AC Load by using 5V DC operated signal supply. Protection from the highly sensitive circuit from a high voltage circuit and – If you need to drive a high voltage motor using the command with a microcontroller then the optocoupler will provide switching system with the full electrically isolated connection between motor and …
Opto Switches - Learn About Electronics
https://www.learnabout-electronics.org/Semiconductors/opto_54.php
The Opto Slotted Switch Interface. The input LED of the slotted OPB370 switch chosen for this demonstration has a maximum current rating of 50mA and the data sheet for the OPB370 shows that at 20mA the forward voltage of the LED will be about 1.3V. To provide a reasonably bright illumination from the LED, it is driven via R1 with IF at about 37mA.
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