For the three and more legged things
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Paul Barker
No idea why I do this anymore
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Post by Paul Barker » Sat Aug 09, 2014 6:14 pm

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.


Not expensive
I can do it right or I can do it now, but I can't do it right now.

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Old Hand
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Location: Germany

Volume control?

Post by rowuk » Sat Aug 09, 2014 7:19 pm

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.
Whenever I feel blue, I start breathing again.

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