5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

Programmable Sequential (CB18156E)
This circuit works with small 5 V incandescent lamps but can be modified to operate with LEDs. The...
Game clock generator (CB7003E)
This circuit found in Radio Electronics can be used in games to produce a random pulse train. The...
Bridge photometer (CB12980E)
This photometer is based on a Wheatstone bridge that must be balanced by the linear potentiometer P1. The...