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#1 LDR's

Posted: Sat Aug 09, 2014 6:14 pm
by Paul Barker
Just found I have a pair of vintage Mullard RPY18

rated at 0.75 watts 200v

Resistance 1Ω to 1MΩ

Nice range, nice power rating.

Might find myself a use in audio for these.

Data

Not expensive

#2 Volume control?

Posted: Sat Aug 09, 2014 7:19 pm
by rowuk
You could connect it to a Peltier device and vary the resistance by temperature. Alternately, a halogen light bulb generates enough heat, it would be kind of like an LDR.