Institute Newton C. Braga

Circuit Bench

Voltage Monitor and Comparator (CB6086E)
We found this circuit in a Popular Electronics of the 80s. The circuit can be made with almost any...
Transformerless 12V x 50mA Power Supply (CB4564E)
We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...
Unijunction Modulated Siren (CB11821E)
This circuit has three settings, central sound frequency, modulation speed and modulation depth. The...