This circuit of a 1964 Electronic Design uses a photodiode from the time. Modern equivalent can be used. The standby current is 1.2 mA.
January 2017 - Through Mouser Electronics Texas Instruments is launching its new zero-drift...
This circuit can be used to test continuity or even semiconductors. We found the configuration in a 1987...
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...