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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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. |
#2
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Analogue datapot
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#3
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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. |
#4
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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. |
#6
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Analogue datapot
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#7
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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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