Institute Newton C. Braga

Circuit Bench

Darkroom photometer (CB8344E)
This circuit is from the time when photos were revealed in darkrooms. We found it in a 1968...
Transistor Crystal Oscillator (CB5115E)
The resonant circuit depends on the crystal frequency that can go up to a few megahertz. The...
Triac and UJT Dimmer (CB857E)
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...