Institute Newton C. Braga

Circuit Bench

Signaling alarm (CB20532E)
This circuit was found in a publication from the 50's. The circuit uses germanium transistors of...
Metal Detector –Transmitter (CB24665E)
This sophisticated metal detector was published in the November 1980 issue of Radio Electronics magazine....
Series Crystal Butler Oscillator (CB25557E)
This circuit was described in an article in the February 1993 Radio Electronics magazine. The...