[mythtv-users] Where to buy CommandIR ?

Brian Wood beww at beww.org
Mon Aug 2 21:45:23 UTC 2010


On Monday, August 02, 2010 03:32:08 pm William Powers wrote:
> On Mon, Aug 2, 2010 at 3:55 PM, Gert van der Knokke <gertk at xs4all.nl> wrote:
> > Chris Hoff schreef:
> > If these emitters are simple IR LED's why not attenuate the current
> > through them by means of a simple resistor. Just keep increasing the
> > value up to the point the receiver stops responding then use a resistor
> > value slightly less than this. You could even use a adjustable resistor
> > in the range from 1 to 10 k or so.
> 
> I addition to many methods of optical attenuation (some with at least
> partial success), I also tried electrical attenuation with six series
> resistance values:  100, 1k, 2.2k, 4.7k, 10k and 47k ohms.  None of
> these result in any improvement.

It would depend a lot on the nature of the power supply, whether it's constant voltage (regulated), constant current or 
just a typical crappy voltage source, with poor regulation.

But I suspect you will have the best luck with optical methods.


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