Re: [PATCH] TT S2-1600 allow more current for diseqc

["André Weidemann" <Andre.Weidemann@web.de>]

Hi Hermann,
On 30.04.2010 02:31, hermann pitton wrote:

> Hi,
>
> Am Mittwoch, den 28.04.2010, 17:13 +0400 schrieb Manu Abraham:
>> On Wed, Apr 28, 2010 at 12:33 PM, Guy Martin<gmsoft@tuxicoman.be>  wrote:
>>> On Wed, 28 Apr 2010 09:45:39 +0200
>>> André Weidemann<Andre.Weidemann@web.de>  wrote:
>>>
>>>> I advise not to pull this change into the kernel sources.
>>>> The card has only been testet with the a maximum current of 515mA.
>>>> Anything above is outside the specification for this card.
>>>
>>>
>>> I'm currently running two of these cards in the same box with this
>>> patch.
>>> Actually, later on I've even set curlim = SEC_CURRENT_LIM_OFF because
>>> sometimes diseqc wasn't working fine and that seemed to solve the
>>> problem.
>>
>> I would advise to not do this: since disabling current limiting etc
>> will cause a large problem in the case of a short circuit thereby no
>> protection to the hardware. In such an event, it could probably damage
>> the tracks carrying power on the card as well as the tracks on the
>> motherboard, and in some cases the gold finches themselves and or the
>> PCI connector.
>>
>> Generally, there are only a few devices capable of sourcing>  0.5A, So
>> I wonder ....
>>
>> Regards,
>> Manu
>
> for the few devices I do have, you seem to be for sure right.
>
> All the Creatix stuff drawing up to 900mA on a potentially dual isl6405
> has direct voltage from the PSU over an extra floppy connector.
>
> Max. 500mA should be sufficient with a DiSEqC 1.2 compliant rotor.
> Nothing else should come above that limit.
>
> I wonder, if someone close in reading specs just now, can tell if 900mA
> can be sufficient for two rotors ;)
>
> Andre, BTW, assuming you still have a CTX944 (md8800 Quad), can you
> measure if the 16be:0008 device really does switch between 13 and 18V.

You seem to mistake me for someone else. I do not have a CTX944 and 
never had.

Regards
  André