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<div><span class="gmail_quote">On 5/4/05, <b class="gmail_sendername">Dennis Lou</b> <<a href="mailto:dlou99@yahoo.com">dlou99@yahoo.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">> The project I'd really like to produce is a<br>>solder-free parallel port LED<br>>kit. I can almost do it with an old DB25 serial
<br>>port header (from old<br>>386/486 computers) and LEDs with integrated<br>>resistors. But finding suitable<br>>LEDs with integrated resistors is<br>>difficult (ie. not as easy as a walk to<br>>the local RadioShack).
<br>> Any suggestions?<br><br>Weren't the control lines on the original PC/XT<br>parallel ports open collector? I don't know<br>if modern parallel ports are different, but if<br>it's the same situation you could<br>just jam a standard resistor in there (brightness
<br>will be limited by the pullup resistor, though).<br><br>-Dennis</blockquote>
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<div>Yes. I just wanted a solution where a person could jam a LED (with integrated resistor) into pins 2 (data bit 1) and 18 (ground) of a female ribbon cable connected to the parallel port. With a separate resistor and LED, some permanant connection (soldering, although twist and tape might work) is required. An integrated resistor LED solves this problem. Jam 8 of these LEDs into pin 2-9 connected to pins 18-25 and you've got a solder-free LED solution. Apply a little epoxy to prevent shifting (and shorting) and you're all set.
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<div>Christopher David Petersen</div><br> </div>