Institute Newton C. Braga

Circuit Bench

Booster for cassette player (CB22151E)
This amplifier for small cassette tape players was found in an English documentation from 1969. The...
SCR Visual alarm (CB24128E)
This circuit, with printed circuit board, is from an article in Radio Electronics magazine from...
Megaphone (CB14802E)
We found this traditional configuration of a megaphone with a coal microphone in an American...