Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

Light operated switch (CB8257E)
This circuit is from a 1967 RCA publication. The components are of the time, admitting...
10 Second Timer (CB21421E)
This circuit from a 1966 General Electric manual makes use of an SCS. The time is given by the...
Photodiode amplifier (CB6862E)
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...