[SI-LIST] : Fw: Relay switching spike

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From: David Sanderson (dsanderson@dy4.com)
Date: Tue Jun 20 2000 - 03:55:07 PDT


Srajudheen wrote:

>
>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.
>
>

Your relay coil will of course be inductive and unless you have a snubber,
you will get 'spikes' every time you switch it on or off.

The are various snubber schemes you can use: diode, RC or C. You might just
want to try strapping a capacitor across the coil - something fairly
arbitary like a 0.1uF. You will probably find this improves things no end.

Snubbers can slow down the tun-on and turn-ff times of the relay - but in
your case, I doubt this would be a problem.

David Sanderson
DY 4 Systems UK Limited

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