Switch debouncer

Posted on Aug 2, 2012

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.

The circuit operates as follows: Assume that you have not yet pressed S1 and that C1 is in a charged state. Under these conditions, R1 drives IC1 toward VSS (ground), causing the IC to consume virtually no power. This action allows VOUT to remain nea

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