Institute Newton C. Braga

Circuit Bench

40-meter transmitter (CB9380E)
This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of...
Zener Regulated Wien Oscillator (CB14907E)
This sinusoidal oscillator was found in Radio Electronics in 1989. It uses a 741, but other...
Turning Linear Potentiometer into Log with the 741 (CB12179E)
This circuit changes the actuation curve of a 47k or 50k linear potentiometer so that it becomes...