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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Square to Triangular Converter (CB6098E)
This circuit converts square (rectangular) signals into triangular signals with typical 16 V...
Signal Tracer and Injector (CB5891E)
The transistors of this circuit found in an English 1980s documentation may be the modern BC548...
AND Gate LM3900 (CB14201E)
In the figure we have an AND gate with the LM3900 operational transconductance amplifier. The...