Institute Newton C. Braga

Circuit Bench

Crystal Pierce Oscillator with Bipolar Transistor (CB13120E)
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...
Bicycle Speed Alarm (CB13735E)
This circuit was found in an American magazine in 1978. It activates a relay when the speed of a...
Isolated NO Switch (CB12714E)
An interesting and useful configuration for the control of power loads is shown in the figure. In this...