5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

| Clique na imagem para ampliar |

Astable with Transistors (CB12633E)
This circuit generates a rectangular signal whose frequency depends on the electrolytic...
Transistor Tester (CB11156E)
This simple tester for general purpose transistors was obtained in an Argentine publication from...
Indicator light (CB22085E)
This circuit is intended for calls to the deaf and is indicated in an old English documentation. LEDs can be...