Institute Newton C. Braga

Circuit Bench

Electret Microphone Amplifier (CB15643E)
With the circuit shown, we have an excellent level for the signal obtained from an electret...
Astable 555 with two potentiometers (CB25510E)
This circuit has both frequency and duty cycle control. We found it in the October 1992 Radio...
Dual Gate MOSFET Oscillator C (CB15471E)
The circuit shown in the figure is characterized by stability and the use of a common component. This...