Crystal Load Cap

Discussion in 'General Electronics Chat' started by foxhenry, Apr 17, 2009.

  1. foxhenry

    Thread Starter Member

    Mar 27, 2009
    15
    0
    hi guys, need your ideas on this:

    i go this circuit a 12Mhz crystal with a load capacitance of 20pF, then the two parallel cap c2 and c3 i put 18pF. would it just be fine?

    or what's the ideal value for the cap? thanks.

    attached is the pic of the circuit..
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If you don't have some 20pF caps, you could use a couple of 10pF caps in parallel. Radio Shack carries an assortment of ceramic disc capacitors for a couple of bucks. The values you'll get is a grab bag, and lately they're putting in a LOT of 1pF caps - but you should still be able to mix/match a few to get the right value.
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    Using an other value capacitors may cause a little frequency shift.
    See the attached PDF

    Greetings,
    Bertus
     
  4. foxhenry

    Thread Starter Member

    Mar 27, 2009
    15
    0
    thanks for all the replies.. :)
     
Loading...