Key debounce circuit diagram

Button anti-shake circuit control circuit

Shown is a circuit that uses an RC integrating circuit to achieve clutter filtering and waveform shaping (Figure 1).

At the moment S1 is turned on, due to contact bounce, the voltage at point A will show high-speed intermittent phenomena, and then S1 is turned off.

This is also the case, as shown in Figure 2. However, since the voltage across the capacitor needs to be slowly charged from the voltage through the resistor,

The electricity will rise, causing the potential of point B to rise slowly: the same is true when S1 is OFF, the capacitor voltage is discharged by R, so that

The voltage at point B drops slowly. This change, after Schmidt inversion trimming, can result in a standard negative pulse output, such as

The waveform is shown at point C.

figure 1