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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Isolated Audio Transmission using Standard Optical Isolator - A Standard Optical Isolator Linarity Can Improved For Audio Applications By Using A Current Drive
There are special optical isolators available with separate feedback circuits designed for high linearity and fidelity but, for non-critical applications, a standard opto isolator may be adequate if it is driven by a current source instead of a voltage.
This eliminates the non-linear input LED voltage to current relationship, with the output current being quite linear with respect to the input current, especially for low current levels.
Below is the LTspice simulation of such a circuit...
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