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This page is a study in how you select the resistors for an Opto-coupler (opto-isolator) circuit. The basic principles of optocoupler circuits are not complex... But given all the things that can be different from one need for an optocoupler and another, you may need help with figuring out the "right" values (resistances) for the resistors in the precise circumstances you find yourself in.
The following goes through how I worked out the answers to those questions in a case where I needed to set up an optocoupler circuit....
Please get in touch if you discover flaws in this page. Please mention the page's URL. (Sheepdogguides.com/elec/princ/Op_toCouplerCalcs.htm).
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