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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100 MHz Oscillator (CB6187E)
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...
Micro High Voltage Generator (CB25720E)
Of course, the current is extremely small, but a voltage of 300 V can be obtained from 9 V of a...
Solid State Relay (CB25258E)
We found this solid-state relay circuit that can function as a shield in a Radio Electronics...