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Little tiny potentiometers!!!

creanzworld17

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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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Hemlock_Mike

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

HMike
 

creanzworld17

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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.
~Steve
 

Greenmechanic

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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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