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Author Topic: BOCHEN WXD3-13 vs 3590S ( Review - comparison) Precision Wirewound Potentiometer  (Read 724 times)

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Offline Kiriakos GR

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For now this topic this is mostly an announcement of upcoming comparison of  BOCHEN vs BOCHEN products differences.

Both low-cost Wire wound Potentiometer they do come from the same source, both are 10 turn (multi-turn) pot .
a) Type 3590S this is advertised as Precision one.
b) Type WXD3-13 this is advertised as regular ten turn pot.

Unfortunately BOCHEN Home page this is a poorly designed website.

It is impossible to do side by side comparison of technical specifications. 
Due the fact that I have an active project this requiring one 10K multi-turn pot, I did order both pots so I to have the chance of one detailed comparison.

Type WXD3-13 seems capable for accepting maintenance, but due my experiences I am aware that when such a pot this goes bad ... Then there is no after life for it  :P

Back in time BOURNS this was the holly-grail of (multi-turn) pot,  but nowadays for non critical applications I do prefer alternatives.
I am starting to believe that BOURNS Mexico printing has copied so many times in China that now we all using BOCHEN factory products with out us to be aware of it.
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Offline Kiriakos GR

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It looks like that we do not live in to a perfect world.   :D

3590S which I received this is stamped as Bourns and works great, actually I did use it at my LM317 project

From the other hand, BOCHEN WXD3-13 that I got it is an BOCHEN WXD3-13, at my first test at about 2/3 of inner parts travel I did spot mechanical noise an very specific setting.
While this potentiometer it does work,  this incident of moving parts to scratching it other it did alert me and I asked from the seller for a new replacement.
I am currently waiting for new replacement so to make my mind regarding bellow questions.

a) Did I receive a bad apple ?
b) Are these apples problematic due product design or due poor quality control?

Currently I do assume that in about ten days I will have my answers.

 
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Offline Kiriakos GR

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End of story.  :(

Second received  BOCHEN WXD3-13 (this send to the seller directly from the factory ) this also have defects, at single travel one direction run this has one issue, at reverse direction in two spots moving parts they are scratching it other.

In conclusion: BOCHEN  factory work this is a bad joke, if you need such potentiometer give your vote to Bourns alternatives.

 
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Offline Kiriakos GR

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I thought to give Bochen a third chance, mostly because of 5% tolerance specification and because similar multi-turn from Vishay and Contelec they are extremely overpriced at retail channels.
Starting from 25 ~ 65 Euros for a single pot this is act of War against consumers.  ???

My new testing application for BOCHEN WXD3-13 this is for it to work as voltage reference Trim Circuit.
And now I hope to see minor temperature coefficient drift in comparison to 3296 trim-pot clones that you can buy more than ten with a single Euro coin.

Generally speaking I did some extended homework regarding precision potentiometer, in some cases the current this passing from the wiper this should be limited and to follow manufacturer specifications. 
I am currently unaware of 3296 trim-pot and clones Max allowed current this passing from the wiper.
From the other hand BOCHEN WXD3-13 this is a 2W monster and the application of voltage reference Trim Circuit, this is actually a Zero load application for it.

I have just finished my circuit modification, now I am waiting for my air-tight voltage reference circuit to thermally stabilize, soldering heat to equalize with current room temperature that is 27 Celsius.
Two hours later I will perform a final adjustment, then I will monitor over all voltage stability for three days, only then I will be able to say if I am happy or not with the results.  :) 
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