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From: BeeJ on 23 Jul 2010 11:44
Kari Laine expressed precisely :
> Hi,
>
> it is the thunder season here in Finland so I got interested how these
> surge protectors are built - which say they will save you hardware from
> spikes - yeah....
>
> Are there avalanche diodes and coils?
>
> I have a dim feeling I have asked this before...
>
>
> Best Regards
> Kari

Adding to pimpom.
You asked what was in those devices.
You will have to open up one from your locale.
Here in California, we have Radio Shack stores around the corner and my
friend an I were trying to do something similar so we went to Radio
Shack and opened one up.
Inside we found the MOV and a toroid. The toroid may have been wound a
a balun or simply as an inductor. We did not want to cut into it to
see. This also helps reduces spikes coming in. In our case we were
trying to stops spikes going out of an appliance so we added some 500V
ceramic caps (essentially high frequency filters across the line) to
further reduce that noise spectrum that might interfere with X10
devices we have plugged in around the house. We are in test phase now.


From: Jasen Betts on 24 Jul 2010 04:06
On 2010-07-23, BeeJ <nospam(a)nowhere.com> wrote:

> Adding to pimpom.
> You asked what was in those devices.
> You will have to open up one from your locale.
> Here in California, we have Radio Shack stores around the corner and my
> friend an I were trying to do something similar so we went to Radio
> Shack and opened one up.
> Inside we found the MOV and a toroid. The toroid may have been wound a
> a balun or simply as an inductor.

balun?? probably as a common-mode choke (both windings in parallel)

> We did not want to cut into it to
> see. This also helps reduces spikes coming in. In our case we were
> trying to stops spikes going out of an appliance so we added some 500V
> ceramic caps (essentially high frequency filters across the line)

You should use X capacitors for cross-line applications


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