Re: [SI-LIST] : Fw: Relay switching spike

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From: Joan Vicent Castell Balaguer (Castell@tsc.upc.es)
Date: Tue Jun 13 2000 - 10:31:11 PDT


Srajudheen escribió:

> >
> >I am switching a relay between 21v and Read signal of microprocessor for
> >programming an EPROM. But while switching from 21v to read a 21 v spike is
> >coming to the read signel. Can I know the reason, and how can I solve this
> >problem.
> >
> >
>
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Hi Srajudheen,

It looks like a bouncing. I meen, when you close a switch the contacts can
bounce due to their mechanical character, creating in your Read lead one or a
series of rectangular spikes. Another thing is when you open the switch: if the
load is something inductive and there is some current flowing a L · dI/dt
spike will appear, but I don't thing this is your case.

You can try to change your relay whith another one but to go fast I sugest you
to replace it whith a PNP-BJT. Solid state switch doesn't have bouncings.

I hope it helps you,

Joan V. Castell



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