[mythtvnz] Sky STB internal DC voltage.

[Paulgir]

On Sun, 05 Aug 2012 01:40:01 +1200, criggie <criggie at criggie.org.nz> wrote:

> On 04/08/12 21:53, yuri wrote:
>> On 3 August 2012 19:40, Paulgir wrote:
>>> A friend has asked me if I can build a 12V to whatever supply to make a
>>> Sk...... STB mobile (I know Sky don't like their STBs  
>>> "migrating").This is
>>> for use in a camper.
>>
>> Any reason why they don't just put an inverter in the camper?
>> An inverter would allow them to plug in any 230V appliance.
>
> Two reasons
>
> 1)	Inverting to 230V AC then rectifying back to 12V DC is a waste of  
> power, which is important if you're off the grid.  Not so much if you're  
> in a caravan park with power.
>
> 2)	Inverters don't generally create the cleanest AC wave form.  Mine  
> puts out a two step square wave, which is enough to make a CRT buzz, and  
> also made the magic smoke come out of a watt-meter
>
> There are special DVD/VHS players and TVs/monitors which have 12V DC in  
> and are designed to work in a caravan.  I doubt many are  
> freeview-compliant though.
>
>
My friends have a nice 21" Samsung semi-smart TV with a built-in DVD drive  
that has Freeview and runs on 12V.