Institute Newton C. Braga

Circuit Bench

Rectangular oscillator CA3140 (CB9219E)
Found in Radio Electronics from the 90s, this circuit has frequency and active cycle adjustment....
Audio Alarm (CB6422E)
Found on 90's Popular Electronics, this circuit triggers when the microphone picks up a sound. The...
Liquid Crystal Clock (CB24302E)
This CMOS logic-based circuit was found in the April 1974 issue of Radio Electronics magazine. The circuit...