Try a small (+-270R) resistor in series with the crystal.

Ian Rozowsky
Engineering Manager
Centurion Systems
P.O. Box 506
Cramerview 2060
South Africa
Tel   : +27-11-462-4499
Fax   : +27-11-704-3412
e-mail: roz@centsys.co.za
web: http://www.centsys.co.za

----- Original Message -----
From: "Nuri ERGINER" <nerginer@SSM.GOV.TR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 23, 2001 09:13
Subject: [PIC]:something unusual


> Hi,
>
> I program and build my first pic16f84a project it is offcourse a flashing
> led.
> What is unusual is the circuit is working when I touched the 4 mhz cristal
> by my hand.
> I connect 3 470 resistor to rb0,rb1,rb2 then I connect 3 led between
> resistors and ground.
> I use 4mhz cristal connected to pic and I use 2 22pf cristal to ground I
> connect the vss and vdd.
>
> Is there any mistake with the circuit?
>
> Regards,
> Nuri Erginer
>
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