Institute Newton C. Braga

Circuit Bench

Mains Voltage Indicator (CB11532E)
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...
Light Relay (CB18451E)
The sensor for this light relay found in a 1967 Japanese magazine is a common photocell. The...
3 to 30 V x 1 A Adjustable Regulatoru 741 (CB16262E)
This adjustable regulator uses the 741 and power transistors and can supply a current of up to 1...