Institute Newton C. Braga

Circuit Bench

Voltage Comparator Light Relay (CB11264E)
This circuit was obtained from my Mechatronics Sourcebook, published in the United States. In it...
Doorbell 555 (CB4756E)
This circuit was found in an old Poptronics but is still current as transistors can be replaced...
Locked CMOS Alarm (CB19225E)
Unlike the previous circuit (CB19224E), this circuit locks after firing, even if the sensor loops...