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Old 2nd Sep 2019, 7:22 pm   #1
ColinTheAmpMan1's Avatar
Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 1,190
Default 500R potentiometer with switch.

Does anyone have a 500R potentiometer with switch that they would be prepared to part with? Linear track is preferred. This is wanted to add a "lights" 5VDC supply to a Tektronix 7623A 'scope. I have all of the other bits and what I want to do is have the ability to not only switch the "lights" on and off, but also adjust the intensity. I don't think the wattage is critical, as the pot will be setting the voltage from a LM350 regulator. I know I could purchase a brand new one from the likes of Digikey for 4+, but I am being a bit of a penny-pincher....

PS: Yes, it is 500 ohms, not 500K ohms.

Last edited by ColinTheAmpMan1; 2nd Sep 2019 at 7:23 pm. Reason: Clarification of value.
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Old 3rd Sep 2019, 3:52 pm   #2
Diabolical Artificer
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Location: Sleaford, Lincs. UK.
Posts: 5,165
Default Re: 500R potentiometer with switch.

After an extensive rummage the best I could find Colin was a used dual 5k/1k SP/ST push SW type, if of any use drop us a PM.

Curiosity hasn't killed this far.
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Old 5th Sep 2019, 6:19 pm   #3
Tim's Avatar
Join Date: Jan 2003
Location: Bradford on Avon, Wiltshire, UK.
Posts: 2,827
Default Re: 500R potentiometer with switch.

Hi Colin. Since you require a linear characteristic you could always get say a 1k or 5 K ( or any value really , in theory, and parallel an appropriate resistance across the track to bring the total down to your 500 ohms.
"Nothing is as dangerous as being too modern;one is apt to grow old fashioned quite suddenly."
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