Jaume Aragay Badia wrote:
> 
> Tjaart van der Walt wrote:
> 
> > I don't think the problem lies in the relay switching circuit,
> > but rather in the supply for the PIC. The 45Vac obviously
> > creates a lot of noise in the supply rail to the PIC.
> 
>         But the 45 Vac are not in the coil, so aren't they supposed to be
> *isolated* from the coil lines which are the ones related to the unregulated
> voltage lines also *isolated* from the pic using the 1N4007 diodes?
> 
>         These 45 Vac are NOT connected to the board, they just come in a wire to
> the *switch* in the relay to leave to the other machine through the other
> wire... Can this disturb the PIC suply?

Hook a scope onto the supply, and check if it looks noisy 
when the 45V supply is present. That's the only way to 
answer this question. 
> 
> Thanks for your fast answer.
> 
> Jaume.

You're welcome.

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