Institute Newton C. Braga

Circuit Bench

Operational Power Supply (CB21854E)
This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974....
Capacitive Switch (CB4994E)
This capacitive switch or approximation relay was found in a 1980s US publication. Power should...
Audible Logic Probe (CB13787E)
We found this logic level indicator in a 1976 amateur radio documentation. The circuit is powered by...