There are crystals or resonators with buildt in caps.

    KreAture

----- Original Message -----
From: "Edson Brusque (PICList)" <c.i.tronics@TERRA.COM.BR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, November 28, 2002 11:33 PM
Subject: [PIC]: HS (Crystal) oscillator without caps?


> Hello,
>
>     I'm building a little gadget using a PCB I've made some time ago.
> This PCB was made for a PIC16F628 using it's internal 4MHz oscillator,
> and the two XTAL pins are connected to two side-by-side LEDs on the PCB.
>
>     Now, this gadget needs to run at 20MHz, so I'm soldering the XTAL
> pins at those PCB holes made for the two LEDs. The thing is working very
> well, but I don't have where to place the two (15-33pF) XTAL capacitors
> on this PCB.
>
>     My question is: Can I just leave out those caps? I know the caps are
> needed for giving the oscillator better stability, but if this little
> gadget are working ok without the caps, will it do any harm? Like
> someday this gadget wouldn't startup, or will it suddenly stop...
>
>     Best regards,
>
>     Brusque
>
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>
>

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