[sdiy] LDR optocoupler blowout

[Lanterman, Aaron]

On Sep 19, 2012, at 4:05 PM, Matthew Smith wrote:

>> With the slow response of LDRs and the regular means of controlling LED brightness being PWM, I wonder if these could be used as a digitally controlled resistor, assuming that one clocked the PWM comfortably above the response time of the LDR. Just a thought.

Some senior design students I was informally advising did exactly that, using PWM to control the Vactrols in a Buchla-style lowpass gate circuit. It worked pretty well IIRC.

- Aaron