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AcademicGround >> Question on Pot Usage


7/17/05 11:13 PM
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jgibson
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Edited: 17-Jul-05
Member Since: 04/30/2001
Posts: 5661
 
I have a potentiometer. It has 3 terminals. What goes where? Where do I attach the input signal. Where do I attach the output terminal. And why does it have three terminals?
7/17/05 11:28 PM
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Power Paw
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Edited: 17-Jul-05
Member Since: 01/01/2001
Posts: 2646
troll me once, shame on you, troll me twice, shame on me... mr. EEng can't figure out a potentiometer? or you just wanted to use that thread title i'm leaning towards the latter :-P
7/18/05 12:27 AM
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jgibson
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Edited: 18-Jul-05
Member Since: 04/30/2001
Posts: 5662
I do like the thread title. But no, really. I am still a newbie to EE stuff. I'm just getting into it after getting rid of all my other engineering requirements. I've got this circuit I'm breadboarding. When I hook up the pot to an LED, it seems to work just fine. But now I've got it hooked to a transistor (an NPN), and when I adjust the pot for less resistance, the NPN should shut off the flow to the emitter, but it isn't. I've tried switching out several transistors and several pots, but I just can't seem to get it to work. I've got the current coming in the A side and the current going out the C side. I am assuming this is correct. What am I supposed to do with the B-side?
7/18/05 11:09 PM
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Power Paw
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Edited: 18-Jul-05
Member Since: 01/01/2001
Posts: 2648
you might try asking this question on the EE forums at eng-tips.com http://www.eng-tips.com/threadminder.cfm?pid=248 you'll have to register first (it's free) http://www.eng-tips.com/register.cfm the people there will help you solve just about anything, large group of engineers of all sorts, but i've noticed they're pretty picky about how you post questions (make sure that the question hasn't already been asked, and check the FAQ section, and it can't be a homework type of question) just my observations/tips i would try to help you with my good friend mr.google but it seems that i would be reading several pages before being able to understand your question, then several more before finding the answer anyways, good luck
7/20/05 2:24 PM
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jgibson
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Edited: 20-Jul-05
Member Since: 04/30/2001
Posts: 5664
Thanks Power Paw. Turns out the pot wasn't the problem. I was using the wrong type of transistor. Ooops.

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