Looks a standard DC connector, but I note he lists it as 8-12V but no
mention of polarity protection, so be careful first on the polarity, but
also get a reasonable quality plug pack, as most  have little in the way of
regulation and may state 12V but can be up to 18V quite commonly. Uf the
clock doesn't have a bridge rectifier in the input, I'd be inclined to make
a simple inline circuit with a bridge rectifier, an LM7812, and a couple of
caps to take the output of an unregulated 12V plug pack, and feed a stable
12V to the clock. The bridge rectifier also eliminates the need to worry
about polarity.

Cheers, Ian
On 13 Jul 2014 10:34, "Dman777" <[email protected]> wrote:

> Hi,
>
> I bought my first Nixie clock! http://www.ebay.com/itm/271174922160
>
> I was wondering, what type/size plug do I need for the power supply? I
> mean the end that plugs into the clock. This is for USA.
>
> Thanks,
> -Darin
>
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