Institute Newton C. Braga

Circuit Bench

Field Strength Meter (CB16475E)
This circuit can measure signals in bands that depend on the coil. With a coil of 30 turns in the...
Headphone adapter as equalizer (CB23842E)
In the figure we have adapter circuits for using stereo headphones in an amplifier without a...
Zero Crossing Detector LM139 (CB14229E)
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit...