power supply question

On 11/19/20 2:50 PM, Erick wrote:



Did you read the reviews?
<https://www.amazon.com/product-reviews/B06XK2ZNKC/ref=acr_dp_hist_1?ie=UTF8&filterByStar=one_star&reviewerType=all_reviews#reviews-filter-bar>

On 11/19/20 4:12 PM, Fox's Mercantile wrote:


nuses?

ie=UTF8&filterByStar=one_star&reviewerType=all_reviews#reviews-filt
er-bar>  

Yes, and mostly positive, but I like to go by more than common laymen  
reviews.

I have not used one of those, but it seems that several companies make  
similar supplies.

There are 2 companies ,one Maxwell and one Meanwell that make them.  I  
don't recall which is the better, but the one that costs the most is  
better.  I have one that I am using in a ham repeater and it has been in  
operation for about a year with no problems.  I do not recall the price,  
but it was less than $ 100.

The only minus of the one I have is the 120 volt screws are out in the  
open and I had to make a cover for that.  There is no off/on switch.

On 11/19/20 3:29 PM, Ralph Mowery wrote:


Lambda "brick" supplies were like that. Still are, and they are 100%
reliable.

But as I've said before, "Pay shit, get shit."

On 11/19/20 4:29 PM, Ralph Mowery wrote:


I decided to return it rather than take a chance on it.  If it were  
going ot be outside or away from indoors, I might give it a try but the  
last thing I want is a toxic smoking end or worse.

I must say I am a bit puzzled why these seem to have a bad rep.  Aren't  
they switching supplies like used in desktop computers?  Every desktop  
computer I ever had never had a power supply burn out.  I've had about 7  
over the last 3 decades and many have run 24 hours a day for nearly a  
year.  If they can make them for PC's reliably, why not these devices?  
They are supposed to be designed for continuous duty too.

On 11/19/20 11:48 PM, Erick wrote:







Simple, if you sell power supplies to Dell, and they burst into flames
and kill a family. Dell will come after you and see to it that you and
your entire family disappear.

On the other hand, if you sell direct to the consumer and someone dies.
Nobody but the immediate family gives a shit.

On 11/20/20 1:52 AM, Fox's Mercantile wrote:


very  

've  


not  

o.


Maybe, but in many cases, both units are being made by the Chinese.  I  
have an old HP desktop power supply sitting here that I have used for  
several years outside of its original environment running 24/7 and it  
has done well.  Made in China like the one I returned.  I don't see a UL  

listing on it either.  Ok, so maybe the cost is 2-3x more if I bought  
the PC power supply new.  Well, I suppose that could be the answer.  a  
12V 24/7 PC supply at say $50 versus a 24V/15A supply for $17.

On 11/20/20 8:03 AM, Erick wrote:


Every  

I've  



 not  

oo.


.

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't see a UL  

ght  




BTW, the seller refunded me even before sending it back which tells me  
they probably have a lot of defective units.  In good conscience, it is  
ready for pickup for the return, however, so even technically "free"  
now, I still won't take a chance.

I have had many computers over the last 40 or so years and worked for a  
company that had around 200 or more computers.  The power supply seldom  
fail.

However during one period in time motherboards were failing.  This was  
due to bad capacitors on the MB.

Quality electronics will have capacitors rated for higher working  
temperatures.  They will uses heaver duty transistors and other  
components.  The cheaper supplies will leave out some components that  
are not necessary , but surpress radio and tv interferance to near by  
radio and tv sets.

You might think of it like bying hamburger meat.  Some of it has a lot  
of fat in it , like 80 % lean. The more expensive 95% lean will cost  
more, but shrink less when cooked.  Same with gas in your car.  The more  
ethanol in it, the cheaper,but you get less gas milage.

There are some good products comming out of China, and a bunch of junk.
Remember a few years back where the drywall off gassed some chemicals  
that ate up the copper wiring and pipe in the homes.

A brand name company needs to keep up their image.  The small company  
produces a product under one name this year and 6 months later they use  
anoter name.  They do not care about quality control.