On Tue, 20 Jan 2004 07:42:06 -0500, you wrote:

>Jinx wrote:
>> I recommend Zetex transistors for the LED switching. They're
>> heaps better than common junk-box transistors (eg 2N2222,
>> BC548, BC337 etc)
>
>Why?  An IR led is typically driven with 50-100mA.  I don't see why that
>should be a problem for a junkbox transistor, like the 2N4401 I use for =
such
>purposes.

=46or long-range applications, peak LED currents of the order of =
500-2000mA are not uncommon. The
Zetex parts are good at doing this sort of thing with sensible base =
current, although you can also
get cheap SOT-23 MOSFETS that are often better for this type of use. =20

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