Institute Newton C. Braga

Circuit Bench

NEC NT71 Desktop Radio (CB18420E)
This commercial NEC radio circuit from Japan has an audio power of 300mW and uses 7 germanium...
FM Digital Tuning (CB16972E)
Originally designed for use in an FM receiver, this 1990 circuit can be adapted for other types of...
Variable siren for alarm (CB9086E)
Found in a 1980’s documentation, this circuit must have its signal applied to an amplifier stage. The...