Institute Newton C. Braga

Circuit Bench

Audio amplifier (CB22175E)
The power transistors in this circuit can be BD135/BD136 or TIP31/TIP32. The circuit is from an...
Visual Test Nerve (CB16396E)
This circuit was found in a 1981 publication and consists of an interesting handicraft game. The...
Alarm Siren (CB19985E)
The transistors in this circuit, found in an American publication in 1975, can be replaced by...