Guest analouge Posted March 18, 2004 Report Posted March 18, 2004 On the DIN module there is a lot of 10k resistors.My question is:what is meant by a pull-up resistor? what is different with these compared to the other ones?`I understand what they are for, but I'm writing an ordering list right now over the parts of the DIN board, so it would be nice to know what I have to order :)thanks folks!
Wilba Posted March 18, 2004 Report Posted March 18, 2004 A pull-up resistor holds an input pin high if the pin isn't connected to anything (ie. connected to an open switch is the same thing). If the pin is brought low by a switch to ground or a low output pin, then current flows from the positive rail through the pull-up resistor to ground/low output pin.Thus 10K is used because it's low current (0.5 mA @ 5V).The cheapest, ceramic 1/4 watt 5% tolerance ones are fine. And if you pay more than US$0.01 each for them, you're getting ripped off. Best to order in bulk from Futurlec and get the chips for US$0.35 too.
Guest analouge Posted March 18, 2004 Report Posted March 18, 2004 OK thanks!I think I know what it's used for now, but not quite sure how they look... ???could someone please post a picture of one or a link to a picture, that would've been nice... ;)What in the world should I do without this Forum?? Great place...cheers :D
DriftZ Posted March 18, 2004 Report Posted March 18, 2004 could someone please post a picture of one or a link to a picture, that would've been nice... http://users.pandora.be/DriftZ/2ndH/g-dinx4.jpghttp://www.ucapps.de/mbhp_din.html
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