Institute Newton C. Braga

Circuit Bench

Automatic light switch (CB7050E)
The purpose of this circuit found in an old Elektor is to light a lower power lamp when the bigger...
Microphone Preamplifier (CB18991E)
This low impedance microphone preamp uses an operational amplifier with FET. The power supply must...
Timer 555 (CB8111E)
Found in a PE Hobbyst Handbook of 1991, this circuit was originally proposed to time photographic...