Isolated shield using photo SCR (CB8077E)

This circuit is from a Popular Electronics from the 90s. It uses an opto-coupler with SCR directly controlling a 20 mA current load.

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Photometer (CB7911E)
This light meter or photometer was found in an American documentation from the 90s. The comparator...
Photo diode sensor switch (CB8335E)
This circuit is from a 1966 NASA documentation. The circuit uses a photodiode as a sensor. The other...
Manual Advertisement Canceller (CB4217E)
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...