Institute Newton C. Braga

Circuit Bench

4W x 500kHz transmitter (CB21803E)
We found this 4W transmitter in a Mullard transistor manual from 1960. The circuit is powered by...
FET Sample and Hold (CB7477E)
This circuit was found in a 1977 Radio Handbook. The MOSFET supports an equivalent. Capacitor C must...
Doors and Windows Alarm (CB18164E)
This simple alarm was found in a 1982 documentation, but uses components that are still common,...