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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10 W Amplifier (CB6287E)
For an 8 ohm load, this Motorola circuit was found in a 1968 documentation. The transistors are of the time...
S-meter for receivers (CB7926E)
The S-meter is a signal strength meter used in communication receivers. This circuit was found in...
Wien bridge oscillator with JFET regulator (CB25910E)
Operating in the range of 1.5 to 15 kHz, this sinusoidal oscillator is based on a 741 operational. The...