Is there any component like "Infinite Turn Potentiomete

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Analyzer

Joined: 18 Nov 2001
Posts: 414

16 Mar 2003 20:21 infinte turn potentiometer

Hi there,

In my project i need a potentiometer that can turn infinitely.You know conventional potentiometers starts from terminal 1 and ends at terminal 3, terminal 2 is located between terminal 1 and 3.I don't want terminal 2 to stop at the end.I want it jump to terminal 1 again.It will start in zero.So i want my potentiometer to turn infinitely.Is there such a device around? If so please tell me its link or company.Thank you.

Analyzer

flatulent

Joined: 19 Jul 2002
Posts: 4877
Helped: 324
Location: Middle Earth

16 Mar 2003 21:03 no

I have never heard of such a thing. You could make one by starting with a rotation optical encoder. This runs a counter that turns over from FFF to 000. The output of this counter runs a digitally controlled attenuator device.

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Kripton2035

Joined: 19 Jul 2001
Posts: 587
Helped: 20
Location: Earth

17 Mar 2003 8:32

I think also you speak about rotary encoders.
you can find datasheets of such things at: http://www.bourns.com/2/comp_13.html

bonus: they send sample if you are student or company.

bunalmis

Joined: 03 Jan 2003
Posts: 254
Helped: 5
Location: Turkey

17 Mar 2003 8:53 Re: Is there any component like "Infinite Turn Potentio

Yes I remeber this potansiometers at the old military servo systems.

You can use incremantal or obsolute shaft encoder. You can count the puls and you can find digital values of positions. After you can produce voltage again by DAC.

twinsen

Joined: 27 Dec 2001
Posts: 104

17 Mar 2003 9:08

I looked for one for ages...wanted to make a cheap weathervane....the closest I came was some conductive plastic potentiometers from some wierd company who never replied to my queries, but even then it had a dead band of 4 or 5 degrees.

Use an optical encoder...they are relatively cheap (if it is a incremental type)
or depending on the application, use a digital pot with up/down?

w w w.usdigital.com is one such supplier

nebisman

Joined: 13 Apr 2002
Posts: 291
Helped: 1

17 Mar 2003 16:37

Bourns produces several of them, and I have proved these devices and I found them very good for servo sytems.

www.bourns.com

part:
3535s-722-502 potentiometer of 5k infinity turning
value in my country US5

Analyzer

Joined: 18 Nov 2001
Posts: 414

17 Mar 2003 19:04

Ok, guys.Thank you very much i will try bourns' products.Good for me, they can send samples Smile

latecomer

Joined: 06 Jun 2001
Posts: 77
Helped: 2
Location: USA

20 Nov 2006 16:21 Re: Is there any component like "Infinite Turn Potentio

Can anyone suggest me a good circuit or procedure to take care of the dead gap in the infinity potentiometers ?

VSMVDD

Joined: 12 Jun 2005
Posts: 558
Helped: 55

20 Nov 2006 17:52 Re: Is there any component like "Infinite Turn Potentio

you get these device in older type vco blocks from ham radio sets
they usualy have a bearing in them to give an indent dented zone you tune the block then to give increments using some fixed pots as part of its allignment procedures
and this indent can make you think they are digital
radios like ft101 101zd had the digital vco and readout
and some heathkit stuff

some musical instruments use them

or you could get the pliers and conductive paint out

try mainline supplies uk they have them or yeasu uk but youll need a part number

or roland uk yamaha uk again youll need part numbers