Institute Newton C. Braga

Circuit Bench

800 Hz Sine Oscillator (CB25580E)
In this phase shift circuit, the transistor can be any general-purpose transistor. The circuit is from...
555 Timer For Long Intervals (CB3980E)
This circuit is from an old Mullard (Philips) manual with applications using the 555. Choosing...
Digital amplifier 7400 (CB22432E)
This simple TTL digital amplifier uses NAND gates and a high impedance speaker. ...