[volt-nuts] HP 419 & Fluke 845

Dr. Frank Stellmach drfrank.stellmach at freenet.de
Thu Mar 25 21:50:56 UTC 2010

On those units, the opto chopper, i.e. the neon bulbs were the crucial 
parts, always.

I suggest trying to replace the neons by LEDs, assuming neons are also 
red emitters.

Their very low leakage currents (not specified) perhaps rely on the CdS 
So a replacement by a 7650 would be sufficient, but perhaps worsen 
parasitic currents.


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