Hi Conrad, if that is the Microchip PSU "brick"
and especially if you are in a 220vac-240vac country,
this sounds like the electros in the PSU brick
need replacing. I had to do mine after less then
100 hours of use. Pathetic design!

At least try replacing the 5v supply with a linear
PSU, like an adjustable lab power supply or a 7805
3-pin regulator or something.
-Roman


Conrad Labuschagne wrote:
>
> Anybody working with an MPLAB ICE system, have you ever had the following
> happen?
>
> environment:    standard breadboard with switchmode psu (5.1v) working on an
> lcd project
> pic simulated:  16f873 (16xko module)
>
> And this is what's happening
>
> 1.Waveforms output on let's say portb viewed with a scope, the duty cycles
> are perfectly seperated, but the horisontal lines are rippled really badly.
> 2.In other instances a pin should be kept at 5v or 0v, but it just floats
> around with a very noise 2v p-p random noise wave.
> 3.Even the 5v line from the pod is full of noise.
>
> This is so bad not even my lcd project wants to work properly and it just
> draws black boxes and 1's on the first line. I thought I could have a power
> problem and my AC power is at around 227v-230V moving around there. But my
> worst fear is my ICE system being stuffed because I don't understand these
> random waves being present at pins I expected to be constant at 0 or 1 . I
> would expect the power supply of the ICE to be stable. But if the ICE is
> damaged, how can I properly be sure, and even worse, what could have
> happened to cause this, I didn't put terrible voltages on it at all. It was
> working fine this morning and then I did some button inputs on porta, and
> since then --- this noise all over the signals.
>
> Anybody have a suggestion?
>
> --
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http://www.piclist.com hint: The PICList is archived three different
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