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20W solid state variable resistance

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LAN_403

radiotech

Mon Dec 05 2011, 05:54AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

How about a mercury column resistor. If you keep the temperature constant
the resistance you set by changing the length wont change.

Avi

Mon Dec 05 2011, 02:21PM

Registered Member #580 Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410

radiotech wrote ...

How about a mercury column resistor. If you keep the temperature constant
the resistance you set by changing the length wont change.

the operating temperature is going to be all over the shop, from 15c to 50c, but i dont need sub ohm accuracy

radiotech

Tue Dec 06 2011, 06:50PM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

If the Hg resistor was made in the form of a closed U manometer, with
one contact at the very botton of the U and the other on one side, you could
adjust it with a small hand pump at the top of the other wide.

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