Several manufacturers have published appnotes describing linear use of opto couplers. Probably HP, Sharp certainly did but I think they dropped out of opto, so you may have to trawl archives. Siemens & TFK are also worth a look.I have a sensitive an unusual dash dimmer switch on my vehicle. 1999 Miata. Unlike most dimmers it does not simply connect the dash lights through a variable resistor to ground.
Because of the complexity of the circuit I need to isolate the circuit optically in order to add an aftermarket radio and gauges [ to dim the lights in the radio and gauges along with the dash]
I have researched this forum and seen posts that suggest that a 4N25 optical isolator can not be used for an analog circuit, just switching circuits. My question is: Why not?
Attached is my proposed circuit, if I am way off base let me know. And if you have an alternate circuit design it would be appreciated.
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by Jake Hertz
by Sam Holland