I've got a friend with a  Harley Davidson chopper who doesn't want to spend
$119 on a LED tail light.  The vibration breaks the filaments in his brake
light way too often.  I bought a cheap 3rd light, brakelight off Ebay to
modify.  It has the super bright LED's (probably the 5,000 mCD type) with
different value current limiting resistors for the two brightness levels.
The LED's are really, really tiny with a plastic focusing lens on each to
give the proper visual effect.  When I hooked it up to my PTT line for fun
on my ham rig, it hurt the eyes it was so bright.  I recommend to experiment
with the value of resistor to get the proper effect.
Mike
----- Original Message -----
From: "Ian Rozowsky" <roz@CENTSYS.CO.ZA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 03, 2001 11:52 AM
Subject: Re: RX/TX LED Drive


> >. Am I supposed to use some current limiting resistor on the led?
>
> YES. The problem you are seeing is that the voltage on output pin is
> dropping to the level of the LEDs forward voltage (Typically 1.5V-2V). A
> suitable series current limiting resistor will ensure that the output pin
> voltage remains at 5V, which can then be used to drive the next stage
> succesfully.
>
> Ian Rozowsky
> Engineering Manager
> Centurion Systems
> P.O. Box 506
> Cramerview 2060
> South Africa
> Tel   : +27-11-462-4499
> Fax   : +27-11-704-3412
> e-mail: roz@centsys.co.za
> web: http://www.centsys.co.za
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body