Analogue datapot
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. |
Analogue datapot
|
Analogue datapot
On Tuesday, 22 October 2019 18:54:32 UTC+1, Fox's Mercantile wrote:
On 10/22/19 11:17 AM, 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. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com Datapot, AKA Rotary Encoder, AKA Shaft Encoder, usually have a digital output. This one is analogue. Cheers, Gareth. |
Analogue datapot
On Tuesday, 22 October 2019 18:54:32 UTC+1, Fox's Mercantile wrote:
On 10/22/19 11:17 AM, 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. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com If you rotate the shaft at a constant rate, I think you get 2 triangle or sine waves out, 90 degrees apart. (Haven't studied it very closely) Cheers, Gareth. |
Analogue datapot
|
Analogue datapot
On Wednesday, 23 October 2019 06:08:18 UTC+1, Mikko OH2HVJ wrote:
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° 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 Thanks, Mikko, yes I believe these are indeed a sin/cos potentiometer. 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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