nugget Posted February 15, 2012 Share Posted February 15, 2012 Hi I'm looking for a 250k linear pot with an off switch at the end of the travel (not a push pull) You know the sort of things some older radios had where the volume knob switched the radio off. All I can find on internet is dimmer light switches which arent right. Can anyone point me in the right direction Ta Dave Quote Link to comment Share on other sites More sharing options...
ikay Posted February 15, 2012 Share Posted February 15, 2012 I think what you're after is a rotary potentiometer switch. Farnell Electronics has a 220k lin version: http://uk.farnell.com/jsp/displayProduct.jsp?sku=1637187&CMP=e-2072-00001000&gross_price=true Quote Link to comment Share on other sites More sharing options...
mart Posted February 15, 2012 Share Posted February 15, 2012 (edited) I think the Fender "No load" tone pot will do what you want. Axesrus have them on their site, although they seem to be out of stock atm. Look here [url="http://www.axesrus.com/axeElectronicsPots.htm#CTS"]http://www.axesrus.c...icsPots.htm#CTS[/url] and scroll down for the Fender stuff. Edited February 15, 2012 by mart Quote Link to comment Share on other sites More sharing options...
icastle Posted February 15, 2012 Share Posted February 15, 2012 You're going to struggle with 250KΩ. Nearest I can find is a 220KΩ one from Maplin, use one of those and stick 3x 10KΩ resistors in line with it if the value is critical? [url="http://www.maplin.co.uk/standard-potentiometers-with-switch-2208"]http://www.maplin.co.uk/standard-potentiometers-with-switch-2208[/url] Quote Link to comment Share on other sites More sharing options...
LawrenceH Posted February 15, 2012 Share Posted February 15, 2012 [quote name='icastle' timestamp='1329321459' post='1540630'] You're going to struggle with 250KΩ. Nearest I can find is a 220KΩ one from Maplin, use one of those and stick 3x 10KΩ resistors in line with it if the value is critical? [url="http://www.maplin.co.uk/standard-potentiometers-with-switch-2208"]http://www.maplin.co...ith-switch-2208[/url] [/quote] Or if the tolerances aren't really tight buy a load and measure each manually - find one about 10% over and you're there! Those Maplin ones are linear though so still may not be suitable Quote Link to comment Share on other sites More sharing options...
nugget Posted February 15, 2012 Author Share Posted February 15, 2012 Thanks - I was looking on Farnell last night and missed those, Gonna get some on order and have a play with tone pot bypass etc Ta Dave Quote Link to comment Share on other sites More sharing options...
icastle Posted February 15, 2012 Share Posted February 15, 2012 [quote name='LawrenceH' timestamp='1329323582' post='1540676'] Or if the tolerances aren't really tight buy a load and measure each manually - find one about 10% over and you're there! Those Maplin ones are linear though so still may not be suitable [/quote] The OP did actually state that he was looking for linear... Quote Link to comment Share on other sites More sharing options...
LawrenceH Posted February 15, 2012 Share Posted February 15, 2012 [quote name='icastle' timestamp='1329325174' post='1540712'] The OP did actually state that he was looking for linear... [/quote] So he did! That'll teach me to skim-read at work more carefully in future Quote Link to comment Share on other sites More sharing options...
Davebassics Posted February 15, 2012 Share Posted February 15, 2012 Interesting idea. Forgive my ignorance but what are the benefits of having no load tone pot? As far as I am aware a tone pot set to "full" passes everything up and over 20kHz. Removing the load wouldn't make a difference to the output signal as the impedances preamp inputs are usually set between 1 and 10M. Am I missing something? Quote Link to comment Share on other sites More sharing options...
ikay Posted February 15, 2012 Share Posted February 15, 2012 [quote name='Davebassics' timestamp='1329340606' post='1541056'] Am I missing something? [/quote] Apparently removing the cap completely does result in a subtly brighter tone, here's a demo (on guitar) http://www.youtube.com/watch?v=dN3SlH-cEAg Quote Link to comment Share on other sites More sharing options...
Davebassics Posted February 16, 2012 Share Posted February 16, 2012 Fair enough. There is a tiny but noticeable difference. Quote Link to comment Share on other sites More sharing options...
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