3-tube receiver 2 (T1603E)

Using known tubes, this receiver was found in a Radio Electronics from 1949. The circuit does not include the power supply.

Complete Timer (CB18775E)
This circuit has an LED indication of the timing progress, having been found in an old...
Infrared Vision (CB24310E)
This circuit is from a Radio Electronics magazine from August 1974. It used one of the first...
Nicad Automotive Charger (CB9538E)
This charger is powered by the car's 12 V socket, the number of diodes being calculated according to...