[time-nuts] Power Supplies

[Bob kb8tq]

Hi

Unfortunately, there usually *is* a difference on each of these supplies. 
They “fine tune” them for one specific voltage. Since the magnetics are 
often done in house, there’s not much of a way to figure out everything 
that they have done.

The risk with any switcher is that they can (and sometimes do) fail in a
dramatic fashion. That may involve taking out the gear they are attached
to when they fail. 

I had that happen with one about two years ago. The device cost $120 to 
replace. What it killed was $400 and could have been up in the $10,000 range. 
Obviously this was not on the bench in the basement …..

Bob

> On May 3, 2020, at 10:26 AM, Steve - Home <steve-krull at cox.net> wrote:
> 
> Hi Bob,
> 
> Main reason was I already have a few 15V ones and would like to reuse them. I have a gut feeling there’s not a major difference between the 12V and 15V models. I may get one of the 12V ones and open it up and do a comparison. I thought maybe someone had been down that path before. 
> 
> Steve
> WB0DBS
> 
> 
> 
>> On May 3, 2020, at 9:15 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> If you want to do it and get full output, the change probably involves nasty things
>> like swapping out inductors …. Likely cheaper to just spend the $16 and buy
>> a brand new one at the right voltage. 
>> 
>> https://www.trcelectronics.com/View/Mean-Well/LRS-100-12.shtml <https://www.trcelectronics.com/View/Mean-Well/LRS-100-12.shtml>
>> 
>> Given the risks of getting a mod “almost right”, it’s probably worth the piece of mind
>> with a new one as well. 
>> 
>> Bob
>> 
>>> On May 3, 2020, at 9:53 AM, Steve - Home <steve-krull at cox.net> wrote:
>>> 
>>> Has anyone found schematics for the Mean Well supplies? I have a couple of 15V 7A ones that will adjust down to 14.1 and I’d like to get them down to the 12-13.8 range. 
>>> 
>>> Steve
>>> WB0DBS
>>> 
>>> 
>>> 
>>>>> On May 3, 2020, at 8:43 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
>>>> 
>>>> Hi
>>>> 
>>>> 
>>>>> On May 2, 2020, at 8:10 PM, Perry Sandeen via time-nuts <time-nuts at lists.febo.com> wrote:
>>>>> 
>>>>> Learned Gentlemen,
>>>>> I personally dislike equipment that uses *wall warts* due to quality concerns
>>>>> One inexpensive way I've powered my Lucent equipment is using used laptop power supplies. They're easily found at HamFests or on ebay.  On Ebay prices very wildly.  If you buy 3 or 4 they can be $5 each shipped.
>>>>> Another source to consider are the Mean Well SRPS at Jameco. 
>>>> 
>>>> If you are shopping for Mean Well supplies, TRC
>>>> 
>>>> https://www.trcelectronics.com/mean-well <https://www.trcelectronics.com/mean-well>
>>>> 
>>>> is a good place to shop. They are a (if not the) factory direct US distributor for the
>>>> brand. That should eliminate the risk of getting one labeled Meen Well or Men Well or ….
>>>> That sort of thing is pretty common on eBay.
>>>> 
>>>> At least on the stuff I’ve shopped for, their prices are pretty good. They deliver next 
>>>> day on the cheap. Of course that’s probably because they are about 2 hours down the
>>>> road from here :) 
>>>> 
>>>> Bob
>>>> 
>>>>> They run from 55 watts on up with a wide range of voltages.  They are have spec sheets.  Some SRPS's on ebay are cheap but their quality.......
>>>>> Regards,
>>>>> Perrier
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