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74HC14 and different valued pots

Discussion in 'Electronic Basics' started by themadscientist, Apr 8, 2004.

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  1. I'm ordering the parts suggested from an earlier post

    http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8
    &safe=off&threadm=4064f078.850025%40news.highstream.net&rnum=9

    and had a quick question. What would be the difference if I used a 1MEG
    pot over a 10K pot or vice versa? Is a lower resistence better in this
    application?

    Thanks.
     
  2. Beau Schwabe

    Beau Schwabe Guest

    The higher the pot value, the lower the frequency or number of counted
    pulses. You can compensate this by reducing the capacitor value in
    the RC circuit. Accuracy is going to depend on the min/max frequency
    range you set by your RC values, the computers ability to distinguish
    individual pulses, and the amount of cpu time you are willing to burn
    counting pulses. You will need to experiment to determine an optimal
    range for your application. I would recommend building this on a
    solder-less bread board before you do any hard wiring.



    Beau Schwabe
     
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