AC voltage probe (CB8185E)

This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be of any type or color.

Oven control (CB7962E)
This sequential circuit with an optical coupler was found in a Popular Electronics from the 90s to...
Power Supply for Alarms (CB16777E)
This power supply originally created for the CB16776E project but can be used for any type of 12 V...
Noise Transmitter CIR6169S (CB4343E)
We found this circuit in a 1989 publication. Its purpose is to produce noise in the VHF or UHF...