What about running the circuit off a battery supply that is charged with
your typical supply.  Then you don't have to worry about spikes per se,
and you have a backup system.

Lucian wrote:

>Yes, you are right, but I woudn't like to risk that in other
>environments, this source resets again and I want to know the cause of
>this behaviour. It is a source for an alarm system and it is not allowed
>to reset. I will try first with a larger capacitor, even if it is now of
>3300uF and I consider it big enough...
>
>Lucian
>-----Original Message-----
>From: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of j h
>Sent: 12 mai 2004 03:43
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE:] EMI Filtering for Linear Power Supply
>
>Do the lights in the room dim when the fridge kicks on? if you have a
>decent multimeter, check and see if the voltage sags when the fride
>kicks on. I'm not sure how to fix that, but finding the problem is the
>first part of the soluton.
>
>Lucian <luciffer@HOME.RO> wrote:Hello all,
>
>I am designing a 12V linear power supply and now in the final stage I
>see I have some problems with the EMI (or so I guess). I have a circuit
>powered from this supply and when the refrigerator in my room starts, it
>resets the circuit.
>In your oppinion, is the EMI the cause of this problem ? What could I do
>to overcome it ?
>I hope I have explained it clearly. Thank you in advance for your
>answers.
>
>Lucian
>
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