Institute Newton C. Braga

Circuit Bench

1-Transistor Radio TR120k (CB18412E)
This simple earphone receiver was sold in the 1960s in Japan. The circuit uses a single germanium...
Headphone amplifier (CB23888E)
This headphone amplifier using a pickup coil can be used as an extension for devices such as TVs,...
Electronic Shot (CB15939E)
The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that...