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Cheap bench supply?

 
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ceengland7(at)gmail.com
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PostPosted: Mon Dec 10, 2018 12:30 pm    Post subject: Cheap bench supply? Reply with quote

On Tue, Nov 13, 2018 at 4:59 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

Quote:
Anyone have experience with the recent ebay offerings for cheap lab supplies? Example below. I tried searching my old AEC emails, but the most recent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after that, so don't want to spend $hundreds. 
0-30v/0-10a bench supply

Thanks,
Charlie



Well, I said I'd publish a pirep once I received the unit, so here we go.
The unit seems to work just fine, with a couple of 'idiosyncrasies'.  The controls are analog, as you'd expect from the pairs of coarse  & fine adjustment knobs. The only frustrating thing is that current limit is set by setting voltage to some reasonably low value, setting current to minimum, shorting out the + & - terminals, and then dialing up the current knobs to the desired limit. Then remove the short and connect your load. At loads less than the current set point, the voltage display shows your set point voltage (actual output voltage). The current display will vary between zero and the current set point, depending on actual load. Once the current limit is reached, voltage (and the displayed voltage, of course) falls to limit current to the preset level. 
Behavior of the supply is as expected, but it is frustrating to not see the actual current limit set point while in operation, until you actually hit the limit. Since the knobs are unmarked, this requires going back through the limit setting for each new work session, unless you trust that the current limit knobs haven't been touched since the last session. The ideal supply would have both set point and output displays, but for my limited needs, I don't need to pay for ideal. Smile
Assuming long term survival, I consider it a great value compared to the $hundreds required for lab grade supplies.
Charlie

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ashleysc(at)broadstripe.n
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PostPosted: Mon Dec 10, 2018 7:45 pm    Post subject: Cheap bench supply? Reply with quote

Hi Charlie;
Bought one. Haven't used it yet. Check back.
Cheers! Stu.
From: "Charlie England" <ceengland7(at)gmail.com>
To: aeroelectric-list(at)matronics.com
Sent: Monday, December 10, 2018 12:29:39 PM
Subject: Re: Cheap bench supply?

On Tue, Nov 13, 2018 at 4:59 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

Quote:
Anyone have experience with the recent ebay offerings for cheap lab supplies? Example below. I tried searching my old AEC emails, but the most recent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after that, so don't want to spend $hundreds.
0-30v/0-10a bench supply

Thanks,
Charlie



Well, I said I'd publish a pirep once I received the unit, so here we go.
The unit seems to work just fine, with a couple of 'idiosyncrasies'. The controls are analog, as you'd expect from the pairs of coarse & fine adjustment knobs. The only frustrating thing is that current limit is set by setting voltage to some reasonably low value, setting current to minimum, shorting out the + & - terminals, and then dialing up the current knobs to the desired limit. Then remove the short and connect your load. At loads less than the current set point, the voltage display shows your set point voltage (actual output voltage). The current display will vary between zero and the current set point, depending on actual load. Once the current limit is reached, voltage (and the displayed voltage, of course) falls to limit current to the preset level.
Behavior of the supply is as expected, but it is frustrating to not see the actual current limit set point while in operation, until you actually hit the limit. Since the knobs are unmarked, this requires going back through the limit setting for each new work session, unless you trust that the current limit knobs haven't been touched since the last session. The ideal supply would have both set point and output displays, but for my limited needs, I don't need to pay for ideal. Smile
Assuming long term survival, I consider it a great value compared to the $hundreds required for lab grade supplies.
Charlie

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nuckolls.bob(at)aeroelect
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PostPosted: Mon Dec 10, 2018 8:44 pm    Post subject: Cheap bench supply? Reply with quote

Quote:

Behavior of the supply is as expected, but it is frustrating to not see the actual current limit set point while in operation, until you actually hit the limit. Since the knobs are unmarked, this requires going back through the limit setting for each new work session, unless you trust that the current limit knobs haven't been touched since the last session. The ideal supply would have both set point and output displays, but for my limited needs, I don't need to pay for ideal. Smile

Assuming long term survival, I consider it a great value compared to the $hundreds required for lab grade supplies.


Your observations are typical of every knob-adjusted power
supply I've worked with for decades. The only devices
with pre-set current/voltage values are digitally
addressed. I have one of these guys in my stable:

https://tinyurl.com/ydxv9edb

It performs as advertised but in my opinion,
not nearly as 'agile' as the 4-knob, analog
supplies. But I do confess to being functionally
predisposed. Been using those critters since
'63.





Bob . . .


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cluros(at)gmail.com
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PostPosted: Mon Dec 10, 2018 10:13 pm    Post subject: Cheap bench supply? Reply with quote

For those of us who do not care about limiting the current, is there a cheaper way of getting 20A between 5 and 30V?

On Mon, Dec 10, 2018, 20:49 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com) wrote:

Quote:
Quote:

Behavior of the supply is as expected, but it is frustrating to not see the actual current limit set point while in operation, until you actually hit the limit. Since the knobs are unmarked, this requires going back through the limit setting for each new work session, unless you trust that the current limit knobs haven't been touched since the last session. The ideal supply would have both set point and output displays, but for my limited needs, I don't need to pay for ideal. Smile

Assuming long term survival, I consider it a great value compared to the $hundreds required for lab grade supplies.


  Your observations are typical of every knob-adjusted power
  supply I've worked with for decades. The only devices
  with pre-set current/voltage values are digitally
  addressed. I have one of these guys in my stable:

https://tinyurl.com/ydxv9edb

  It performs as advertised but in my opinion,
  not nearly as 'agile' as the 4-knob, analog
  supplies. But I do confess to being functionally
  predisposed. Been using those critters since
  '63.

 



  Bob . . .


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yellowduckduo(at)gmail.co
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PostPosted: Tue Dec 11, 2018 4:13 am    Post subject: Cheap bench supply? Reply with quote

One can usually replace the analog current potentiometer with a multi
position rotary switch and fixed resistors if preferred. I find that
about 6 positions suits my bench supply just fine.
Ken

On 10/12/2018 3:29 PM, Charlie England wrote:
Quote:


On Tue, Nov 13, 2018 at 4:59 PM Charlie England <ceengland7(at)gmail.com
<mailto:ceengland7(at)gmail.com>> wrote:

Anyone have experience with the recent ebay offerings for cheap
lab supplies? Example below. I tried searching my old AEC emails,
but the most recent reference I found was for a much more
expensive model. It'll get minimal use; just final checkout of my
project's wiring and then rare uses after that, so don't want to
spend $hundreds.
0-30v/0-10a bench supply
<https://www.ebay.com/itm/10A-Digital-DC-Power-Supply-Variable-Adjustable-Lab-Bench-Test-Equipment-Tool/202435783331?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649>

Thanks,

Charlie
Well, I said I'd publish a pirep once I received the unit, so here we go.

The unit seems to work just fine, with a couple of 'idiosyncrasies'.
The controls are analog, as you'd expect from the pairs of coarse  &
fine adjustment knobs. The only frustrating thing is that current
limit is set by setting voltage to some reasonably low value, setting
current to minimum, shorting out the + & - terminals, and then dialing
up the current knobs to the desired limit. Then remove the short and
connect your load. At loads less than the current set point, the
voltage display shows your set point voltage (actual output voltage).
The current display will vary between zero and the current set point,
depending on actual load. Once the current limit is reached, voltage
(and the displayed voltage, of course) falls to limit current to the
preset level.

Behavior of the supply is as expected, but it is frustrating to not
see the actual current limit set point while in operation, until you
actually hit the limit. Since the knobs are unmarked, this requires
going back through the limit setting for each new work session, unless
you trust that the current limit knobs haven't been touched since the
last session. The ideal supply would have both set point and output
displays, but for my limited needs, I don't need to pay for ideal. Smile

Assuming long term survival, I consider it a great value compared to
the $hundreds required for lab grade supplies.

Charlie

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rickofudall



Joined: 19 Sep 2009
Posts: 1355
Location: Udall, KS, USA

PostPosted: Tue Dec 11, 2018 7:49 am    Post subject: Cheap bench supply? Reply with quote

Get some number transfers so you can set the knobs to the same settings you require. Set the top to 11 and watch "Spinal Tap" for a giggle. :-}

Rick
On Tue, Dec 11, 2018 at 6:18 AM C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)> wrote:

Quote:
--> AeroElectric-List message posted by: C&K <yellowduckduo(at)gmail.com (yellowduckduo(at)gmail.com)>

One can usually replace the analog current potentiometer with a multi
position rotary switch and fixed resistors if preferred. I find that
about 6 positions suits my bench supply just fine.
Ken

On 10/12/2018 3:29 PM, Charlie England wrote:
>
>
> On Tue, Nov 13, 2018 at 4:59 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)
> <mailto:ceengland7(at)gmail.com (ceengland7(at)gmail.com)>> wrote:
>
>     Anyone have experience with the recent ebay offerings for cheap
>     lab supplies? Example below. I tried searching my old AEC emails,
>     but the most recent reference I found was for a much more
>     expensive model. It'll get minimal use; just final checkout of my
>     project's wiring and then rare uses after that, so don't want to
>     spend $hundreds.
>     0-30v/0-10a bench supply
>     <https://www.ebay.com/itm/10A-Digital-DC-Power-Supply-Variable-Adjustable-Lab-Bench-Test-Equipment-Tool/202435783331?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649>
>
>     Thanks,
>
>     Charlie
>
>
> Well, I said I'd publish a pirep once I received the unit, so here we go.
>
> The unit seems to work just fine, with a couple of 'idiosyncrasies'.
> The controls are analog, as you'd expect from the pairs of coarse  &
> fine adjustment knobs. The only frustrating thing is that current
> limit is set by setting voltage to some reasonably low value, setting
> current to minimum, shorting out the + & - terminals, and then dialing
> up the current knobs to the desired limit. Then remove the short and
> connect your load. At loads less than the current set point, the
> voltage display shows your set point voltage (actual output voltage).
> The current display will vary between zero and the current set point,
> depending on actual load. Once the current limit is reached, voltage
> (and the displayed voltage, of course) falls to limit current to the
> preset level.
>
> Behavior of the supply is as expected, but it is frustrating to not
> see the actual current limit set point while in operation, until you
> actually hit the limit. Since the knobs are unmarked, this requires
> going back through the limit setting for each new work session, unless
> you trust that the current limit knobs haven't been touched since the
> last session. The ideal supply would have both set point and output
> displays, but for my limited needs, I don't need to pay for ideal. Smile
>
> Assuming long term survival, I consider it a great value compared to
> the $hundreds required for lab grade supplies.
>
> Charlie
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
>       Virus-free. www.avast.com
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link>
>
>

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PostPosted: Thu Dec 13, 2018 9:05 am    Post subject: Cheap bench supply? Reply with quote

At 12:12 AM 12/11/2018, you wrote:
Quote:
For those of us who do not care about limiting the current, is there a cheaper way of getting 20A between 5 and 30V?

That's going to be a 600W supply . . . pretty rare
in the constellation of off-shore offerings to hobbyists.

Fixed voltage supplies in that power class are readily
available, here's one example

https://tinyurl.com/y6tw6k6o

Adjustable supplies with that capability
are more likely to be found as used,
lab grade power supplies like this
excellent buy

https://tinyurl.com/ybgkh4ov

. . . but trust me, supplies in this
power class are capable of much smoke.
You will come to LOVE that current
limiting feature.





Bob . . .


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PostPosted: Thu Dec 13, 2018 10:42 am    Post subject: Re: Cheap bench supply? Reply with quote

That excellent buy costs $92 to ship. It must be big and heavy.

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PostPosted: Thu Dec 13, 2018 11:52 am    Post subject: Cheap bench supply? Reply with quote

At 12:42 PM 12/13/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

That excellent buy costs $92 to ship. It must be big and heavy.

Yup . . . probably 40 pounds. They're rack mounted
supplies about 9 inches high. I have one on my
bench. Had it about 15 years and it was
10-15 years old when I got it. It's HP . . . built
to last. Probably cost about $3000 new.



Bob . . .


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PostPosted: Thu Dec 13, 2018 11:58 am    Post subject: Cheap bench supply? Reply with quote

At 12:42 PM 12/13/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

That excellent buy costs $92 to ship. It must be big and heavy.

Yup . . . probably 40 pounds. They're rack mounted
supplies about 9 inches high. I have one on my
bench. Had it about 15 years and it was
10-15 years old when I got it. It's HP . . . built
to last. Probably cost about $3000 new.

CORRECTION. Closer to 40 years old when I
got it and they're 93 pounds.



Bob . . .


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lyn.robertson(at)gmail.co
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PostPosted: Thu Dec 13, 2018 2:34 pm    Post subject: Cheap bench supply? Reply with quote

The HP stands for “heavy product”. Wink
On Thu, Dec 13, 2018 at 12:03 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

Quote:
At 12:42 PM 12/13/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

That excellent buy costs $92 to ship.  It must be big and heavy.

 Yup . . . probably 40 pounds. They're rack mounted
 supplies about 9 inches high.  I have one on my
 bench. Had it about 15 years and it was
 10-15 years old when I got it. It's HP . . . built
 to last. Probably cost about $3000 new.

 CORRECTION. Closer to 40 years old when I
 got it and they're 93 pounds.



  Bob . . .


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