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Analogue datapot
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sound....@btconnect.com
Oct 22, 2019, 12:18:00 PM10/22/19
to
Hi,
haven't come across this before, but I have a unit with several datapots.
They aren't the usual square wave out things, they have 4 connections, and the outputs output a varying analogue output from the (eg 5v) input.
for clarity, 2 pins are 5v and ground. The 2 outputs output 0 - 5v sinewaves when turned, 90 degrees apart I think, so direction can be determined.
Don't even know what these are called, and haven't found anything similar so far.
They are the size of a typical 6mm shaft clicky datapot from Alps or Bourns, but obviously don't click, or have any discrete steps at all.
Unit in question is:
https://www.long-mcquade.com/134528/
Cheers,
Gareth.
haven't come across this before, but I have a unit with several datapots.
They aren't the usual square wave out things, they have 4 connections, and the outputs output a varying analogue output from the (eg 5v) input.
for clarity, 2 pins are 5v and ground. The 2 outputs output 0 - 5v sinewaves when turned, 90 degrees apart I think, so direction can be determined.
Don't even know what these are called, and haven't found anything similar so far.
They are the size of a typical 6mm shaft clicky datapot from Alps or Bourns, but obviously don't click, or have any discrete steps at all.
Unit in question is:
https://www.long-mcquade.com/134528/
Cheers,
Gareth.
Fox's Mercantile
Oct 22, 2019, 1:54:32 PM10/22/19
to
On 10/22/19 11:17 AM, sound....@btconnect.com wrote:
> for clarity, 2 pins are 5v and ground. The 2 outputs output
> 0 - 5v sinewaves when turned, 90 degrees apart I think, so
> direction can be determined.
>
> Don't even know what these are called, and haven't found
> anything similar so far.
Shaft encoders.
> for clarity, 2 pins are 5v and ground. The 2 outputs output
> 0 - 5v sinewaves when turned, 90 degrees apart I think, so
> direction can be determined.
>
> Don't even know what these are called, and haven't found
> anything similar so far.
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
sound....@btconnect.com
Oct 22, 2019, 2:20:41 PM10/22/19
to
This one is analogue.
Cheers,
Gareth.
sound....@btconnect.com
Oct 22, 2019, 2:29:07 PM10/22/19
to
On Tuesday, 22 October 2019 18:54:32 UTC+1, Fox's Mercantile wrote:
(Haven't studied it very closely)
Cheers,
Gareth.
et...@whidbey.com
Oct 22, 2019, 5:05:26 PM10/22/19
to
On Tue, 22 Oct 2019 11:29:03 -0700 (PDT), sound....@btconnect.com
wrote:
Since the device is being powered up and outputs a sine wave doesn't
that mean it must be powered with AC? If that's the case it sounds
like it may be a resolver.
Eric
wrote:
that mean it must be powered with AC? If that's the case it sounds
like it may be a resolver.
Eric
Mikko OH2HVJ
Oct 23, 2019, 1:08:18 AM10/23/19
to
sound....@btconnect.com writes:
> Hi,
>
> haven't come across this before, but I have a unit with several datapots.
> They aren't the usual square wave out things, they have 4 connections, and the outputs output a varying analogue output from the (eg 5v) input.
>
> for clarity, 2 pins are 5v and ground. The 2 outputs output 0 - 5v sinewaves when turned, 90 degrees apart I think, so direction can be determined.
>
> Don't even know what these are called, and haven't found anything similar so far.
Could it be sin/cos potentiometer ? They usually have contiuous 360°
> Hi,
>
> haven't come across this before, but I have a unit with several datapots.
> They aren't the usual square wave out things, they have 4 connections, and the outputs output a varying analogue output from the (eg 5v) input.
>
> for clarity, 2 pins are 5v and ground. The 2 outputs output 0 - 5v sinewaves when turned, 90 degrees apart I think, so direction can be determined.
>
> Don't even know what these are called, and haven't found anything similar so far.
resistive element and two wipers at 90° angles for sin/cos signals.
They are/were used as absolute encoders and 360° dial settings.
In modern equipment encoders are used more often, but with these you get
non-volatility, analog signalchain and usually quite nice 'know
feeling'.
--
mikko
sound....@btconnect.com
Oct 23, 2019, 3:29:50 AM10/23/19
to
It does have a nice feel in use, but it appears these wear out in exactly the same way the usual digital encoders do, and now I can't find anything remotely similar to replace them with.
Cheers,
Gareth.
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