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ITTSB Blog Specific > ITTSB - Small projects by Kiriakos & User reviews
BOCHEN WXD3-13 vs 3590S ( Review - comparison) Precision Wirewound Potentiometer
Kiriakos GR:
--- Quote from: xavier60 on January 13, 2020, 08:16:33 AM ---I'm having trouble with the cheap 3590S 10K Pots from ebay sellers. After some use, the resistance element goes open circuit.
This is bad when the Pots are used in a bench power supply as the voltage set point will jump from 0V to full reference voltage as the wiper passes over the break. Has anyone had the same type of failure?
I'm now using WXD3-12 10K Pots, hoping that they are better.
--- End quote ---
It would be wise of you to measure the current this feeding (passing) the pot in your application, among with the voltage.
When some one does DIY design the pot watt sizing must be also calculated and the appropriate one Pot to be selected.
WXD3-12 this is 1W (max operating voltage 160V).
xavier60:
Over a year of using the Bochen WXD3-12 pots with no open wire type failures. They can go scratchy which I fix with some PAO oil.
In my PSU application the 10K pots are dividing 5V reference for CV and CV settings.
There might be some reliable non Bourns 3590S pots out there but which ones?
Maybe the Bochen 3590S pots are good? http://www.bochen-cn.com/3590.html
Kiriakos GR:
--- Quote from: xavier60 on October 06, 2021, 09:35:57 PM ---Maybe the Bochen 3590S pots are good?
--- End quote ---
You are looking their 2019 build and abandoned since, website.
Non existent links to Facebook and Twitter.
Their FAQ page talks of product warranty with out commitment for a specific time of coverage.
I am unable to demonstrate blind trust to them.
Even so, feel free to test their email, and nag about the issues that you have.
I am all ears for your own upcoming feedback, of how they will respond back to you .. will they replace at their cost the scratchy ones?
At my Kenwood DC power supply (Made in Japan) that I use often, I did find for it genuine 10 turn Bourns (UK stock).
At my voltage reference, the Bochen still does the job, but it purpose it is to stay unmovable :)
xavier60:
I realize that complaining to them is pointless, I would rather fix the problem myself if possible and move on.
I want others to know from my recent experiences that the "Bochen" branded WXD3-12 pots are proving to be more reliable
than the 3590S pots from ebay and Aliexpress which have unknown origins.
I should have said that by "scratchy" I mean intermittent wiper contact. PSUs can be designed to fail safe with this problem.
A different story when the resistance wire in the pot breaks, sending the PSUs output to full voltage.
There is no passive way to safe guard from this.
Kiriakos GR:
--- Quote from: xavier60 on October 06, 2021, 11:01:40 PM ---I realize that complaining to them is pointless, I would rather fix the problem myself if possible and move on.
I want others to know from my recent experiences that the "Bochen" branded WXD3-12 pots are proving to be more reliable
than the 3590S pots from ebay and Aliexpress which have unknown origins.
--- End quote ---
They are several significant reasons, that me, an active troubleshooter, I am unable to agree with such low-end Asian factory practices.
"Bochen" logo does not represent a branded solution to me, so to blindly trust.
All Chinese firms does not do any more Quality Control Inspection at the production line, so them to remove the cost of it, and convert it in to profit too.
June of 2021, I did an order of specific Logitech computer accessories, a keyboard and a mouse, two times delivery , two times return back to the shop due poorly working and physically damaged goods.
They did remove at factory Quality Control Inspection too.
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If your complain to them "Bochen" this ended as pointless... this makes them or prove them as liars.
EU market and products distribution chain, this has still a positive side, electronics parts distribution this is made due large and due smaller firms, in other words there is local stock of genuine parts, but you need to make few more phone-calls so to discover of whom haves it, when you need it.
We use to know as acceptable new product fail rate (DOA), an 3% from the advanced industries even from Japan.
"Bochen" logo seems to have an 45%.
In such a Chinese race of whom has 50% of DOA and of whom has 45% of DOA, I am not going to participate as a feedback provider.
The only solution for a hobbyist, this is if you are in need for two good working pots (no-name), then buy ten and use only the working ones.
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