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Old 1st August 2006, 03:06 PM   #1
luka is offline luka  Slovenia
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Default electronic adjustable resistor

Does any one have this kind of resistor?
For testing supplys,amps,...
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Old 1st August 2006, 03:12 PM   #2
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I'm not sure what you need. These might not deal with reverse polarities, ....I didn't check'm out. <http://www.home.agilent.com/cgi-bin/...OUNTRY_CODE=US>
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Old 1st August 2006, 03:21 PM   #3
luka is offline luka  Slovenia
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Yes like that, but I would like to build one myself,but I dont know where to start, and I don't have any schema for now.
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Old 1st August 2006, 03:24 PM   #4
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You could parallel up a bunch of MOSFET's and bias the gates up to make an adjustable power resistor. I've never tried that, but in concept it works. It sounds interesting
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Old 1st August 2006, 03:29 PM   #5
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That's what I thougt, but gate drive must be somewhat complicated, because it has to keep the resistance the same, independeble of voltage applyed to mosfer's.
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Old 1st August 2006, 03:34 PM   #6
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.. Yes, that's where the "fun" would come in. You'd have to monitor the summed currents, measure the voltage across the MOSFETS, then adjust the Vgs to mantain the load resistance.
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Old 1st August 2006, 03:36 PM   #7
luka is offline luka  Slovenia
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Now how to do that...
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Old 1st August 2006, 03:46 PM   #8
luka is offline luka  Slovenia
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It would be great to have adj. max current to.
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Old 1st August 2006, 04:10 PM   #9
luka is offline luka  Slovenia
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Uuu and max power limit.

http://www.elektor-electronics.co.uk...d=28&art=50616
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Old 1st August 2006, 04:42 PM   #10
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We have a great company in NJ -- Transistor Devices -- which makes electronic loads -- they have units which will dissipate 120kW !!! Very often you will see their units for sale on EBay or at Hamfests:

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