Work colleague had nearly exactly the same problem, turned out to vanish when he
ran separate power runs back to the main switchmode
PSU. "Star wiring" both the Hot and Ground fixed it.


----- Original Message -----
From: "Chris Holme" <cholme@...>
To: <mugwa@yahoogroups.com>
Sent: Friday, April 07, 2006 8:22 AM
Subject: [mugwa] Mosfets and relays and nasty spikes what reset your micro


> Hello People
> I don't know if anybody remembers but a year or two ago I had problems
> with turning relays on and off resulting in micro resets. I was using a
> mtp30055vl to switch the relay with an extra diode complimenting the
> inherent one but still getting resets. Dave came up with a theory about
> gate avalanching and spikes and stuff and suggested a transorb as that
> had fixed his problem with the bore pump. Andrew S suggested that I
> might use a resistor pair so that it took real current to turn on the
> mosfet. And Ron suggested using solid state relays instead. I have tried
> all of these methods and combinations of them as well, they all work.
>
> It just occurred to me (which is why I'm firing off this message) that
> maybe a ferrite bead on the wire back to the micro board would also have
> worked. What do you fellers think?
>
> Regards
> Chris Holme
>
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