Institute Newton C. Braga

Circuit Bench

5-Channel Sequential with 20 LED (CB12141E)
We found this circuit in an English publication in 1982, but it can still be easily assembled by...
Manual Bistable with the 741 (CB12689E)
The first configuration we show is a flip-flop that can be triggered using two pressure switches of...
Variable Reluctance Preamplifier (CB12902E)
Some old record players use variable reluctance phono pickups, requiring a special amplifier...