Current to voltage converter (CB7332E)

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

Full wave power supply (CB22265E)
This interesting adjustable power supply uses the transistors themselves as controllers and...
Alarm (CB12604E)
This alarm from an old 1978 publication uses PNP transistors and driver and output transformers that are...
Laboratory Power Supply (CB17304E)
This is a typical source of the time (1989) using the well-known regulator integrated circuit 723....