Contact_Bounce_Suppression_Circuits
Switch debouncer uses only one gate: 05/30/2002 EDN -
Design Ideas / The circuit in Figure 1 produces a single
debounced pulse each time you press S1. Moreover, the circuit
uses only logic power from the remote pull-up resistor, R2. You
can use the circuit to detect when a key is pressed in a
nonenergized device, such as a device in a system that`s just
coming up from standby
