Institute Newton C. Braga

Circuit Bench

TTL Transistors and Diodes Tester (CB13942E)
The LEDs, in addition to flashing if the transistor is good, also indicate the polarity of the...
Medium and Short-Wave Receiver (CB16410E)
This circuit was found in a 1980 documentation. It is an interesting 3-track radio circuit whose...
Shadow Alarm with Intermittent Sound (CB25483E)
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...