Institute Newton C. Braga

Circuit Bench

World’s Smallest Alarm (CB17058E)
This micro-alarm was obtained in a 1995 documentation. It triggers a relay when the sensor is...
Voice Filter with LM381 (CB25283E)
This circuit lets through the 300 Hz to 3kHz range that corresponds to the human voice. We found it...
Adjustable Active Cycle Oscillator 555 CMOS (CB15863E)
To obtain a signal with a variable mark / space ratio in a ratio of 1 to 20 to 20 to 1, we have...