Polyvinylcarbazole to replace Cadmium Sulfide?

[Don Moose]

Returning to the topic of this old Photopot thread, I have been fretting over the fact that Cadmium is a banned substance in RoHS-compliant goods. (Lead Sulfide and Indium Arsenide have similar RoHS issues).

A bit of googling turned up polyvinylcarbazole (PVK) as a potential replacement technology.

PVK has photoresistive (ldr) effects, but it also exhibits photovoltaic behavior (solar cell).

Would any chemists or physicists care to weigh in on suitability of PVK in a photoresistor application, in view of CdS becoming a no-no?

[loudthud]

Should we wait and see what Mesa uses or patent it before what's his name does?

[Don Moose]

I'm in favor of prior art - we don't even have to patent it, just be armed well enough with prior art to kill an application.

[Pedro Vecino]

Should we wait and see what Mesa uses or patent it before what's his name does?

You can see already the system that Fender uses to replace his optocoupler in vibrato circuits:
http://music-electronics-forum.com/s...to+optocoupler
Regards

[Don Moose]

You can see already the system that Fender uses to replace his optocoupler in vibrato circuits:
http://music-electronics-forum.com/s...to+optocoupler
Regards

Yuck - 2 of those per pot?

There has to be a better way.