Motorcycle headlight monitor (CB9117E)

This simple circuit was found in Popular Electronics from the 1980s. The circuit uses an LED as an indicator.

DC Motor Control (CB12292E)
This circuit is from 1977 documentation, but can be assembled with BC548 for Q1, Q2 and Q4, BC558...
Shield for triac (CB25259E)
This circuit uses an optocoupler with a phototriac or optotriac to drive an external triac. The...
Ring Counter with Timing (CB6613E)
This variable timing circuit was found in 1964 General Electric documentation. Circuit uses PUTs...