Institute Newton C. Braga

Circuit Bench

Transistor Tester (CB13990E)
We found this circuit in a 1960 Radioarama magazine. The instrument tests common general-purpose transistors...
12 to 3 V x 1 A Reducer (CB4844E)
In the figure we show how to use common diodes to get a reference near 3 V in a car gearbox. The...
FET MW and SW radio (CB12122E)
This experimental receiver was found in an English publication in 1979. It can receive medium-wave...