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 Forum index » DIY Hardware and Software » YuSynth
1M rev log potentiometer for the yusynth saw animator
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Fri Feb 06, 2009 1:36 am    Post subject: 1M rev log potentiometer for the yusynth saw animator Reply with quote  Mark this post and the followings unread

Can anybody recommend a good 1M rev log potentiometer for the saw animator?

I found this one:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KB1051S28-ND
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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
Audio files: 5

PostPosted: Fri Feb 06, 2009 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

I used this one - it's a 16mm:

http://www.smallbearelec.com/Detail.bok?no=116
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Fri Feb 06, 2009 8:50 am    Post subject: Reply with quote  Mark this post and the followings unread

I got mine from http://www.musikding.de/forums.html/cat/c100_rev-log-pots.html
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Yves
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Fri Feb 06, 2009 8:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. Very Happy
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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
Audio files: 5

PostPosted: Fri Feb 06, 2009 8:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Oops, didn't see you were in Sweden - obviously the link Yves provided will be better for you.
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Fri Feb 06, 2009 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

numbertalk wrote:
Oops, didn't see you were in Sweden - obviously the link Yves provided will be better for you.


I am buying knobs from Smallbear elec eventually so it was not a bad suggestion. Smile
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camelneck



Joined: Sep 27, 2008
Posts: 68
Location: KY (USA)

PostPosted: Tue Mar 24, 2009 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

If you live in the USA, you might want to check with Scott at Bridechamber. He sells 2 values of Rev log (or Rev Audio) pots: 50K & 1M. Both are 16mm (with solder lugs only) and look like the picture that someone posted of the pot from Small Bear. However, he sells his for only $2 so I believe they are a little cheaper.

Both the 50K and 1M rev log pots, as well as a few other, were commonly used in many of the old Moog synthesizers. They were used mainly to control resonance and envelope decay. (I'm not sure what the pot values are for the new Moog synths, ie. the Minimoog Voyager and Little Phatty). One example is the Moog Taurus I. I think it used a 50K rev audio for the variable resonance slider. It also used 500K Rev Audio pots for both the VCA and the VCF ADS EG's.

Although the micromoog and multimoog didn't use Rev Audio pots to control resonance or EG Decay, they used a Rev Audio (or Rev Log) pot for a more unique purpose. Both synths had a 2.5M Rev Audio pot which controlled the LFO Frequency.

I'm not really sure why some Moog ADSR's would use Rev Audio Decay pots while others would use "Audio (or Log)" Decay pots. I would think that the most important factor would be the most commonly used range of resistance values for that particular synth.

Consider the following example to illustrate my point. (I just made the values up. I don't know if 1 to 3 sec is the most commonly used decay times or not.)

Assume the most commonly used decay times for the Taurus EG's range from 1 to 3 sec. (This range would likely be wider for the Micromoog.) If these decay times of 1 to 3 sec corresponds to resistance values of 200K and 300K, you would select the type of taper that would provide the greatest range of pot movement between these 2 resistance values or decay times. (If using a rotary pot the movement would be in degrees. If using a linear pot, the movement could be measured in inches or mm.)

Since this method would result in more movement between the positions of the pot or slider that corresponded to 200K and 300K, this would improve the resolution within this range of values and make it easier to dial-up "in-between values", such as 240K or 260K, which may correspond to 2.0 and 2.2 sec, for example.

Does anybody else have a better explanation?

David
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