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Old 07-08-2012, 06:53 PM   #1
middie8
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Default Stir plate help

Attempted to do one of these and afraid i am in over my head. I got the project box from radio shack, the fan, and a fan controller. My problem is the first cell phone charger i got didnt work. I dont know whether is the charger itself or not. I dont know whether i am attaching it tot the rught wires on the fan controller or not I got a blackberry charger and plugged it in and both wires are hot. Can i send the pics to someone for help please? Thanks.

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Old 07-08-2012, 09:46 PM   #2
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Hi

If both wires are physically hot, then you have shorted something out. It's a pretty common thing to do wiring stuff up. If you happen to have a multi meter (DVM / VTVM / VOM / what ever) set it to ohms and start looking for < 2 ohm readings.

Take a look at all the gibberish on the Blackberry Charger. Somewhere it's going to say: 5.0 Vdc 1.2A or something like that. There is a lot of worthless info to deal with on there as well. What you want is a wall wart that puts out 12 volts at more than 0.1 A. Lots of amps are fine, just don't use one that's below 0.1

Lots of fun...

Bob

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Old 07-08-2012, 09:52 PM   #3
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Originally Posted by carlisle_bob View Post
hi

if both wires are physically hot, then you have shorted something out. It's a pretty common thing to do wiring stuff up. If you happen to have a multi meter (dvm / vtvm / vom / what ever) set it to ohms and start looking for < 2 ohm readings.
while it is unplugged!!!
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Old 07-09-2012, 12:31 AM   #4
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With the blackberry charger i just cut the plug off and used one of those pencil meters thats shows you whether somethin is hot or not. I wanted to find which of the two wires was hot and it was going off for both. I tried another plug for a LG phone and it didnt go off at all for that one so i assume its bogus?

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Old 07-09-2012, 01:12 AM   #5
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get an actual volt/ohm meter of some sort, and try again.

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Old 07-09-2012, 12:02 PM   #6
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Originally Posted by middie8 View Post
With the blackberry charger i just cut the plug off and used one of those pencil meters thats shows you whether somethin is hot or not. I wanted to find which of the two wires was hot and it was going off for both. I tried another plug for a LG phone and it didnt go off at all for that one so i assume its bogus?
Hi

The gizmo you have isn't designed to test what you are looking at. It's likely that the wires are only "hot" relative to each other.

Bob
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Old 07-09-2012, 12:28 PM   #7
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Touch the two wires with the two wires on the fan, if it does not spin reverse the two wires. mark them once you figure out which is which.

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Old 07-09-2012, 12:31 PM   #8
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Touch the two wires with the two wires on the fan, if it does not spin reverse the two wires. mark them once you figure out which is which.
This. Nothing bad is going to happen by connecting them backwards, it just won't spin.
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Old 07-09-2012, 01:28 PM   #9
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this presents another problem as well. i have a fan controller as well. that is what i have been trying to attach the power to. the actual fan has plugs that go to the fan controller and a plug that is black and red. but to this point i have been trying to hook the power to the black and yellow wires to the fan controller. should i be hooking the power straight to the fan?

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Old 07-10-2012, 04:17 PM   #10
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Hi

The power leads to the fan should be black and red. The yellow lead on the fan it's self is a tacometer output. You do not connect anything to the yellow lead from the fan.

Bob

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