Current to voltage converter (CB7332E)

This circuit is from a Popular Electronics from the 90s. The integrated circuit admits equivalents that must be tested.

Low Voltage Flasher (CB6250E)
This circuit was found in Motorola documentation from the 1980s. PUTs are not common components...
Class A No Distortion Amplifier (CB6124E)
This low distortion circuit was found in a 1964 Electronic Design. The transistor admits...
5 Voltage Level Indicator (CB4892E)
This circuit is based on an uncommon Texas component today, as found in an American 1980s...