Institute Newton C. Braga

Circuit Bench

Tone Control Preamplifier (CB18561E)
This preamp with several inputs using germanium transistors from the time was found in Japanese...
Capacitor Tester (CB18798E)
This simple circuit tests electrolytic capacitors from 1 uF with a working voltage above 12 V. The...
Third-order separator filter (CB9618E)
This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for...