ptitjes Posted October 22, 2008 Report Share Posted October 22, 2008 Hello everyone!I was wondering if someone knows if there exists endless rotary pots. I mean rotary potentiometters with endless 360° mechanical rotation (no stopper).I would like to use those pots instead of encoders. I would use 16-bit ADCs and figure out a relative value change. By fetching quickly enough the ADCs I could figure out when the pot has been turn completely.I found this EWVYC pot from Panasonic. However they say "detent pitch 10° min (custom design available)" and I would like no detent at all.http://www.datasheetpro.com/535314_download_EWVYC_datasheet.htmlThanks for your help.Best regards, Didier. Quote Link to comment Share on other sites More sharing options...
Screaming_Rabbit Posted October 22, 2008 Report Share Posted October 22, 2008 1. Yes they exist without detends too2. I wish you happy implementing ;D3. What advantages should it bring besides being just much more expensive than encoders? ::)Greets, Roger Quote Link to comment Share on other sites More sharing options...
ptitjes Posted October 22, 2008 Author Report Share Posted October 22, 2008 Hi Roger!1. Yes they exist without detends tooCool. I found the datasheet do not give complete information for product part numbers. Do you know where I could find more info. Also where I could buy these ?2. I wish you happy implementing ;DThank you :) I don't think it would so hard... Any comment on this ?3. What advantages should it bring besides being just much more expensive than encoders? ::)Continuous values obviously...Best regards, Didier. Quote Link to comment Share on other sites More sharing options...
arumblack Posted October 22, 2008 Report Share Posted October 22, 2008 I fail to see how you can get continuous values using an ADC? even at 16 bits it is still digital, ie not continuous. Higher resolution perhaps. Quote Link to comment Share on other sites More sharing options...
ptitjes Posted October 22, 2008 Author Report Share Posted October 22, 2008 Higher resolutionOK, sorry! This is what I was thinking. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted October 22, 2008 Report Share Posted October 22, 2008 Probably still cheaper and much easier to use a higher res encoder, no? I've seen 360degree pots, and they were like $40 each. Quote Link to comment Share on other sites More sharing options...
ptitjes Posted October 22, 2008 Author Report Share Posted October 22, 2008 Probably still cheaper and much easier to use a higher res encoder, no? I've seen 360degree pots, and they were like $40 each.Do you have links for higher res encoders ?Mouser sells the ALPS RDC803001A at 1.82$. This is another 360° pot (two phase).My problem with the EWVYC and the RDC80 is that they don't have a shaft and I don't know where I could find shafts with their shape at end and D shaft at the other end. Practical suggestions are very welcome :) Quote Link to comment Share on other sites More sharing options...
stryd_one Posted October 22, 2008 Report Share Posted October 22, 2008 Sorry, google_one is a different guy ;)That's a good price... Surely Alps have a matching shaft part? Quote Link to comment Share on other sites More sharing options...
ptitjes Posted October 23, 2008 Author Report Share Posted October 23, 2008 Surely Alps have a matching shaft part?No there isn't... However, it seems to be a standard shape for shafts as Piher has exactly the same shape on their N15s and EWVYCs...But filtering for shafts in shops (mouser, farnell...) always give me lots of potentiometers. I'm having a hard job finding 6mm shafts with 4.5mm D end (for the waldorf knobs... :))I already found :- 6mm diameter with 4.1mm D- 6mm diameter with 4.6mm DI don't think any of these will perfectly fit my knobs... Search is continuing!Best regards, Didier. Quote Link to comment Share on other sites More sharing options...
stryd_one Posted October 23, 2008 Report Share Posted October 23, 2008 Maybe try those... 4.6 might be okay at .1mm too big. Wilba will attest to the observation that waldorf knobs in their native environment (on a waldorf synth) don't come off too easily ;) Quote Link to comment Share on other sites More sharing options...
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