Re: [CAD_CAM_EDM_DRO] debounce circuit

In a message dated 1/2/2004 2:26:45 PM Central Standard Time,
tacman@... writes:
What is a "debounce circuit" as it relates to a digitizing probe,
and does anyone have a schematic for the electronically challenged?
Steve: Logic circuitry, aka "silicon" or "IC's" respond to electrical pulses
which are very, very fast; only picoseconds in many cases. When a
human-operated switch "makes" (or "breaks", for that matter!), the metal actually
"bounces" many times as they "settle" into uninterrupted contact. A "flip-flop" or
"counter" IC will dutifully "count" all these "bounces". ONE press of even a
very fine push-button contact will often give from three to 27 "pulses" when
only ONE was intended. SO, we have to built "no-bounce" or "debounce" circuits
to "interface" between human input and silicon! This is actually a topic
that is OT, here, and I suggest you (or anyone!) find the TTL Cookbook and CMOS
Cookbook by Don Lancaster, aka Guru. Find him at http://www.tinaja.com/

Jan Rowland


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