This circuit was found in RCA documentation from the 1980s. The circuit uses LDRs of the time and the 50 uA instrument has zero in the center. R1 and R2 may have 2k2 and R3 10k typically.
This 16-second voice recording circuit was featured in a telephone answering machine circuit in...
The purpose of this circuit is to stop an AC motor instantly by applying a continuous voltage for...
The circuit is from the Texas Instruments component datasheet. With it currents up to 2.7 A can be...