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Sci.Electronics.Basics -> Smokin' POT
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Author: kayveeDate: 15:03 27-03-08
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Hello everybody. About a month ago I made a post titled "How do I
hook up my potentiometer?" [http://groups.google.com/group/
sci.electronics.basics/browse_thread/thread/c9b1f3cd98cb2e2b/
7faa05598f647c54?hl=en&lnk=gst&q=Potentiometer#7faa05598f647c54]
Now, I ended up hooking it up John Fields' way with the diode in
parallel with the motor [12V]:
.V+>---+---------------+
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. [220] |
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. P /c
. O<------------| NPN Power xsistor
. T \e
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. +---[Motor]-----+
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.GND>--+---[Diode>]----+
Now, I have been using a 12V power supply and a NPN with a high power
rating and I got a hold of a 500ohm POT (unknown power rating). I
hooked it up and all and it runs fine when the POT resistance it
0ohms, but once I start to turn the POT around half way, thus slowing
down the motor, the POT starts to smoke, which in my experience is
bad. Do I just need a POT with a higher power rating, or is there
another way of doing this?
Thanks guys!
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