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Re: [N8VEM: 14588] Switch debouncing and related stuff (like CPU reset circuits)

On 9/8/12 11:50 PM, Sergey wrote:

This diode
in the configuration shown on the diagram is useless.


It does look backwards. A common POR circuit has a R/C
in series, with a diode across the R so that when power
is removed the C discharges through the diode. Sometimes
a reset switch is added which can also discharge C.

     +V
     |
   +-+
   _ |
   ^ R
   | |
   +-+---- to Schmitt trigger input
     |
     C
     |
     GND