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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LED Driver Circuit (CB25415E)
The circuit shown in the figure consists of a system for driving white LEDs (WLEDs) at low...
FET Preamplifier (CB9017E)
This configuration, found in many other circuits in this section, was obtained in a 1970s American...
Cascading the 4518 (CB082E)
The 4518 can be cascaded to count to values higher than 10. The output EN of this device can be...