Re: IRLED's

[cameron shaw <cameron@xxxxxxxxxxxxx>]

On Fri, 14 Nov 1997 17:34:09 +0100 (MET) Helmut Faugel TE wrote:


> On Fri, 14 Nov 1997 tcekolin@xxxxxxxxxx wrote: 
> >      I tried briefly with infrared remote controls, but I got no where with 
> >      them. Either the infrared is very dim from the control, or outside the 
> >      range of IR film.  I'd look at the specs on the led's and make sure 
> >      that they transmit at wavelengths inside the HIE response curve.
> 
> Most of the IR remote contolls are bright but the light they emitt 
> is centered around 950 nm which is beyond the range HIE can record. 
>__________________________________________________

Most infra red remote cotrolls transmit in very short pulses of a few thousandths of 
a second. The emiting diode may produce better results if powered from dc with a 
current limiting resistor. Some manufacturers produce infra red emiting diodes of 
shorter wavelength. eg 800nm. Try looking at some electronic component 
catalouges.
Cameron
	


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