[time-nuts] Power Supplies

[Steve - Home]

I bit the bullet and ordered a pair of 12V supplies. I’ll see what I can suss out for differences when I get them side by side on the bench. 

Steve
WB0DBS



> On May 3, 2020, at 9:39 AM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> 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
>>>>>> _______________________________________________
>>>>>> time-nuts mailing list -- time-nuts at lists.febo.com
>>>>>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>>>>>> and follow the instructions there.
>>>>> 
>>>>> _______________________________________________
>>>>> time-nuts mailing list -- time-nuts at lists.febo.com
>>>>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>>>>> and follow the instructions there.
>>>> 
>>>> 
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at lists.febo.com
>>>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>>>> and follow the instructions there.
>>> 
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at lists.febo.com
>>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>>> and follow the instructions there.
>> 
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.