[volt-nuts] Mechanical choppers for precision instruments

Mark Sims holrum at hotmail.com
Sat Mar 20 17:16:03 UTC 2010

The 845 was built in two different versions.  Early ones used CdS photoresistors and the much later ones used optically isolated bilateral FETs (photofets?) in the chopper.   You might want to review those schematics. 		 	   		  
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