Similar story
I was using one of those small modules abundant on Amazon and eBay. Buck
converter and drop out board. It was noisy so I put a ferrite bead on output
side. One worked ok. Added another and that put the board into full
oscillation and it outputted 37V into a DUT destroying
Thanks Ed, that was another solution I was considering. I’ve got a few LMs in a
drawer, I’ll have to order a few LTs.
Steve
WB0DBS
> On May 3, 2020, at 11:02 AM, ed breya wrote:
>
> If you have a supply with something north of 15V, and you'd like to make 12V
> battery type voltage, it's
If you have a supply with something north of 15V, and you'd like to make
12V battery type voltage, it's easy to add an external solution with a
low dropout three-terminal regulator to take it down a bit and still get
good regulation. Look at LT1085 family, for example.
Ed
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 wrote:
>
> Hi
>
> Unfortunately, there usually *is* a difference on each of these supplies.
>
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
ssibly require
> better / forced air cooling.
>
> Bob L.
>
>> Sent: Sunday, May 03, 2020 at 9:53 AM
>> From: "Steve - Home"
>> To: "Discussion of precise time and frequency measurement"
>>
>> Subject: Re: [time-nuts] Power S
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.
scussion of precise time and frequency measurement"
>
> Subject: Re: [time-nuts] Power Supplies
>
> 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 t
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
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 wrote:
>
> Hi
>
>
>> On May 2, 2020, at 8:10 PM, Perry Sandeen
Hi
> On May 2, 2020, at 8:10 PM, Perry Sandeen via time-nuts
> 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
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
Power supplies are indeed mostly commodity items, but absolutely
essential. I have a large collection of OEM open-frame units, in linear
and SMPS, and a small collection of commercial bench supplies, and some
home-made ones.
You can of course get a bunch of bench units and set them up for
In message <73bfcf33-8b29-38a6-d5a7-9192375d4...@earthlink.net>, jimlux writes:
>I suppose I can package a bunch of those up in a bigger box with banana
>jacks or binding posts.
Use power-pole connectors, they are cheap and *so* much better.
I'm using a couple of fused West Mountain
I’d give a “thumbs up” for the Acopian supplies, too. I have several and they
get used regularly. I haven’t had one die on me yet (knocks on head)
Steve
WB0DBS
> On May 1, 2020, at 6:23 PM, jimlux wrote:
>
> On 5/1/20 12:07 PM, Tim Shoppa wrote:
>> Jim, when it comes to "bench supplies" -
On 5/1/20 12:07 PM, Tim Shoppa wrote:
Jim, when it comes to "bench supplies" - knobs for voltage and meters -
most of the commonly available Chinese bench supplies in the under 3A-range
are linear with series regulator.
This unit (HY1803D) is typical and has a transformer (relay-selected
On 5/1/20 1:11 PM, Mark Sims wrote:
Yes, Power Designs units are VERY good. Some (their precision models) are
insanely good. They have a cult following and can be a bit pricey these days.
There are lots of posts on eevblog.com about them. Dave did a video on one of
the precision units.
Hi
You don’t have to get into the fancy versions to get a nice quiet supply.
One of the guys at Frequency Electronics (I forget who …) turned me
on to them back in the 1970’s. I have not seen any of them selling for the
sort of prices some other supplies seem to command …. Maybe I just
spend
Yes, Power Designs units are VERY good. Some (their precision models) are
insanely good. They have a cult following and can be a bit pricey these days.
There are lots of posts on eevblog.com about them. Dave did a video on one of
the precision units.
I love my R NGT20, I have several of them.
Reasonably clean, analog, uA741 technology, no switcher, knobs for
everything.
3 independent, unconnected outputs:
2* 0-20V@1A for op amps etc
1*0-6V@5A for the digital stuff
for example:
<
Hi
Spend some time on eBay looking for Power Designs bench supplies.
They went out of business years ago so they are not a popular item.
Thus the price is usually pretty reasonable. I have never seen one that
was a switcher….
Bob
> On May 1, 2020, at 2:51 PM, jimlux wrote:
>
> What with
Jim, when it comes to "bench supplies" - knobs for voltage and meters -
most of the commonly available Chinese bench supplies in the under 3A-range
are linear with series regulator.
This unit (HY1803D) is typical and has a transformer (relay-selected
winding depending on the voltage setting) and
If you are patient, you can find Sorensen/Xantrex/Ametek programmable power
supplies on eBay for reasonable prices. Some of them are linear, some
switching. High quality stuff. The XT series are linear bench supplies.
-Pete
> On May 1, 2020, at 11:51, jimlux wrote:
>
> What with telework,
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