Institute Newton C. Braga

Circuit Bench

Dual Tuning MW Radio (CB18315E)
This interesting radio circuit for listening on a crystal phone was found in a Japanese magazine in...
Robot Voice (CB4410E)
We find this microphone voice effect in 1992 documentation. The vibration of the relay contacts...
Bistable with transistors (CB21811E)
Found in Mullard's 1960s transistor manual, this circuit has components that depend on the...