Old 01-11-2010, 01:10 AM #1
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Default Little tiny potentiometers!!!

Anyway to use these tiny ones for homemade drivers, despite the extreme, hair-line sensitivity?Are they able to be used in series with a homemade driver or not? When used in a "real," "factory-made" driver, i know it is quite complex the way it limits the current. On my linear (single turn) 100ohm pot, there are the 3 "pins" which the to are soldered together. As i said earlier. Anyway to use the tiny ones for homemade drivers, despite the extreme, hair-line sensitivity?



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Old 01-11-2010, 01:17 AM #2
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Default Re: Little tiny potentiometers!!!

You need to use Ohm's law and the power law to determine if they can handle the current and power requirements.

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Old 01-11-2010, 01:22 AM #3
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Default Re: Little tiny potentiometers!!!

Well yes I know all that, but i meant i terms of soldering. I.e, where, and what to solder.Sorry, I should've clarified.
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Old 01-11-2010, 01:41 AM #4
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Default Re: Little tiny potentiometers!!!

I've used them on my home-made drivers. You just have to be extremally carefull in the higher ranges. Turning them a screwdriver width is 10 X too much. The ones I have, you use only two pins, wiper and pin 1.
Turning them .05mm results in a 200 mA increase. Also they (or the curcuit) seem to "drift" according to temp. of the driver?
I milled out a 10X8mm finned Alum. heatsink for the driver regulator, applied with thermal paste. That kept the drift to under 40mA (was 120-140mA before heatsink)
Radioshack sells a 1K, 15 turn pot.(271-0342) Seem to work better then the 1 turn, 100 Ohm ones.(which Radioshack does not sell) You still have to be careful in the higher ranges although.(250mA-750mA)
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