Light operated switch (CB8278E)

The circuit shown was found in a 1967 RCA manual. Modern equivalent components can be used. The SCR must be according to the controlled load.

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Power indicator (CB7255E)
Indicated by Popular Electronics to be used with a car headlight, this circuit can also have...
1 000 Hz Colpitts Oscillator (CB3922E)
In this circuit of a 1970s publication, data from the coil to oscillate at the desired frequency...
Comparator with Transistors (CB6550E)
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...