Institute Newton C. Braga

Circuit Bench

Power supply for Transistor Circuits (CB11145E)
This circuit, from an old Argentine publication, uses a slightly different symbology than we are...
Computers Shield (CB16821E)
If you have a disused old computer, the type that still has a parallel port, you can use it in...
Loop Antenna Tuner (CB26263E)
This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The...