Have you made sure you have a "fast" enough power supply?
If it's chemical batteries, you often need a capacitor to beef the power a
bit.
(Especially if parts draw current in pulses...)

I made a parasitic SCHAER compatible LVP ICSP programmer last week.  It
wouldn't operate for more than a sec or two before generating errors...
Turned out it was drawing too much power from the port.  Added a cap of
100uF and all has been well ever since.

    Kyrre

----- Original Message -----
From: "Nick Veys" <nick@VEYS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, November 24, 2002 3:43 AM
Subject: [EE]: Cleaning up oscillator interference


> I'm using an ECS-2100 4MHz clock oscillator in a circuit to provide a
> clock to a MAX155 ADC.  I'm getting lots of interference in the power
> and ground lines on the board at the same frequency up to 2.2V swings,
> it's definitely affecting my ADC readings and I'd like to see what I can
> do to stop it.
>
> Things I've tried:
>
> 1) Low-pass filter
> 2) Big ole' capacitor
> 3) A diode circuit in the datasheet
>
> Nothing seems to do a damn thing and I'm running out of ideas.
>
> Thanks. :)
>
> Nick Veys / nick@veys.com / www.veys.com
>
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