This two-port monostable of the 4001 was suggested by an article in the April 1988 Radio Electronics magazine. The timings are given by C1 and R1.
This circuit goes into operation producing a sound on a small speaker when the supply voltage...
We found this circuit that protects speakers against current surges that occur when the amplifier is...
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...