Continuity latching probe (CB8212E)

This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The indication is made through LED.

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Garage Timer (CB21432E)
Found in General Electric and 1967 documentation, this circuit automatically turns off the...
Low Distortion OTL Amplifier (CB23538E)
This amplifier stage without an output transformer was found in Radio Electronics magazine from...
Flasher for the power grid (CB6797E)
Found in an Electronics World of 1968 this circuit can use current SCRs and the diodes are...