Current to voltage converter (CB7332E)

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

MOSFET Differential Amplifier (CB13744E)
We found this circuit in a technical documentation from the 70's. Any double-gate MOSFET can be...
Power Supply with SCR from 0 to 16 V x 5 A (CB3842E)
We found this thyristor power supply in a 1987 documentation. It uses common SCRs as rectifiers and...
Battery Monitor (CB6067E)
This simple circuit has its trigger point set in the trimpot. The transistor can be any general...