Subject:
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re: ztx614
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 19 Mar 1997 16:56:40 GMT
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Original-From:
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Jeffrey Strauss Morehead <morehead@ece.utexas.edu=saynotospam=>
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Viewed:
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1617 times
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On Wed, 19 Mar 1997, Stefano Nardone wrote
>
> I just looked back to the IR transmitter schematic...
>
> The 1K res + RED LED you see there is for the only purpose of having a visible
> feedback of IR transmission. The IR Led and it's limiting resistor (if the
> case) will be connected in series between pin 3 and 1 of J7. So R5 (1K) will be
> used to limit the current in the visible RED led, but you can get a more
> high current in the IR LED, limited by Q1 VCEsat, and IR led voltage
> drop and additional limiting resistor. IR LEDs have fairly high Imax (pulsed)
> reaching 1A (for very short times...)
Thanks! that was not clear, where did you find info on j7? Is there a IR
transmitter in the parts list? I didn't see one? Do you know what to use
for a transmitter?
thanks,
jm
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