Institute Newton C. Braga

Circuit Bench

Portable Radio as Test Amplifier (CB17436E)
In the figure we show how to use an old portable AM or FM radio as a test amplifier or signal...
Interval timer (CB7504E)
Among other applications, the 1960 Sylvania transistor manual indicates this timer for chess...
VTVM Adapter (CB7347E)
This circuit for voltmeter has an output of 1 V for 100 uA having been suggested by American...