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Re: [ts-7000] Re: Relay boards at 5V

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Subject: Re: [ts-7000] Re: Relay boards at 5V
From: "Alejandro Weinstein" <>
Date: Wed, 29 Oct 2008 14:47:58 -0600
On Wed, Oct 29, 2008 at 2:24 PM, Jason Stahls <> wrote:
> Yan Seiner wrote:
>> Anyone know if I need MOVs/zeners on fluorescent lights?
>
> You shouldn't need them, the transformers in the balast shouldn't create
> that much back EMF but it's not a bad idea anyways. You never know when
> someone might want to connect something else, or worse connects
> something inductive not knowing that they need MOVs...

Since you are using AC, I think you need to use an RC snubber, not a
MOV/Zener/TVS.

Look at http://en.wikipedia.org/wiki/Snubber#Electrical_systems. In
particlar, they say:

"In ac circuits a rectifier diode snubber cannot be used; if a simple
RC snubber is not adequate a more complex bidirectional snubber design
must be used."

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