Institute Newton C. Braga

Circuit Bench

PC address decoder (CB20536E)
This TTL decoder circuit for PC ports was found in a document from 1992. The power supply can be...
Constant current charger (CIR22155E)
The transistor of this circuit can be a BD135 or TIP31. The load current is given by resistor R1....
Tone generator for CW (CB23593E)
This oscillator for telegraphy practice was published in Radio Electronics magazine in March 1958....