Current to voltage converter (CB7332E)

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

Astable with Transistors (CB12633E)
This circuit generates a rectangular signal whose frequency depends on the electrolytic...
Timer Using Unijunction Transistor (CB933E)
This circuit was found in an old publicatio n from the year 1958. The circuit controls an external load by...
Picoampère converter (CB5108E)
This circuit that converts very low currents into voltage was obtained in the 80's used component...