Institute Newton C. Braga

Circuit Bench

Burnt out lamp indicator (CB10449E)
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
Bistable with Two Neon Bulbs (CB10506E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
Transmitter signal monitor (CB21561E)
This circuit reproduces the signal from a nearby transmitter in a phone. The earphone must be...