Today's Message Index:
----------------------
1. 12:12 AM - For Sale [10 Pieces] Apple iPhone XR New 128GB $3,990CAD (eaartphrni)
2. 01:01 AM - Re: Cheap bench supply? (John Tipton)
3. 06:17 AM - Re: Cheap bench supply? (Ernest Christley)
4. 07:03 AM - Re: Cheap bench supply? (Charlie England)
5. 07:57 AM - Re: Cheap bench supply? (Sebastien)
6. 10:05 AM - Re: Cheap bench supply? (Charlie England)
7. 10:07 AM - Re: Cheap bench supply? (Ernest Christley)
8. 10:12 AM - Re: Cheap bench supply? (MMiller)
9. 10:58 AM - Re: Re: Cheap bench supply? (Charlie England)
10. 02:00 PM - Re: Re: Cheap bench supply? (jim)
11. 02:48 PM - Re: Cheap bench supply? (Alec Myers)
12. 06:58 PM - Re: Re: Cheap bench supply? (Robert L. Nuckolls, III)
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Subject: | For Sale [10 Pieces] Apple iPhone XR New 128GB $3,990CAD |
Available to buy on our website www . esellibuy.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=484999#484999
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Subject: | Re: Cheap bench supply? |
What=99s wrong with a =98cb=99 type radio power supply, 13
.8 volts, 3-5 amps, why do you need something giving variable volts/amps, ar
e you really going to test your expensive electronics by playing around with
varying these outputs =94-
John
Sent from my iPad
----x--O--x----
> On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com> wrote:
>
> Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull t
he trigger. I'll report when it comes in.
>
> Charlie
>
>> On 11/13/2018 7:47 PM, Richard Girard wrote:
>> Charlie, this is the one I bought on Amazon. .
>>
>> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ
ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords
=bench+power+supply
>>
>> Rick Girard
>>
>>> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian.lester@gmail.com> wr
ote:
>>> A bit more expensive but I got this from amazon. DC Power Supply Variabl
e,0-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supp
ly Digital
>>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
>>>
>>> But honestly the stuff on eBay looks about the same at a better price.
>>> -Brian
>>>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England <ceengland7@gmail.com> w
rote:
>>>> Thanks, Ernest. Anyone else?
>>>>
>>>>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley <echristley@att.net> w
rote:
>>>>> Looks very much like the onei bought from mpja.com. mine works perfect
ly.
>>>>>
>>>>> Sent from Yahoo Mail on Android
>>>>>
>>>>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England
>>>>> <ceengland7@gmail.com> wrote:
>>>>> Anyone have experience with the recent ebay offerings for cheap lab su
pplies? Example below. I tried searching my old AEC emails, but the most rec
ent 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 th
at, so don't want to spend $hundreds.
>>>>> 0-30v/0-10a bench supply
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Charlie
>>
>>
>> --
>> =9CBlessed are the cracked, for they shall let in the light.=9D
Groucho Marx
>>
>>
>
>
> Virus-free. www.avast.com
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Subject: | Re: Cheap bench supply? |
Several reasons, John.
1) Powering avionics will not be the only reason I ever need a power supply
.=C2- I've used the one I bought for several other electronics projects t
hat required different voltages.
2) You can ramp down the voltage to see where a particular instrument stops
working.=C2- Useful for planning alternator out situations.
3) The ability to limit current allows you to safely test "experimental" el
ectronics.=C2- Apply voltage at 1/2 an amp will let you test a circuit th
at may have=C2- a short.
On Wednesday, November 14, 2018, 4:03:06 AM EST, John Tipton <john@tipt
onuk.eu> wrote:
What=99s wrong with a =98cb=99 type radio power supply,
13.8 volts, 3-5 amps, why do you need something giving variable volts/amps,
are you really going to test your expensive electronics by playing around
with varying these outputs =94-
John
Sent from my iPad
=C2- =C2- =C2-----x--O--x----
On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com> wrote:
Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull t
he trigger. I'll report when it comes in.
Charlie
On 11/13/2018 7:47 PM, Richard Girard wrote:
Charlie, this is the one I bought on Amazon. .=C2-
https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ
ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword
s=bench+power+supply
Rick Girard
On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian.lester@gmail.com> wro
te:
A bit more expensive but I got this from amazon. DC Power Supply Variable,0
-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply
Digital
https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
But honestly the stuff on eBay looks about the same at a better price.
-Brian
On Tue, Nov 13, 2018 at 6:44 PM Charlie England <ceengland7@gmail.com> wr
ote:
Thanks, Ernest. Anyone else?
On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley <echristley@att.net> wro
te:
Looks very much like the onei bought from mpja.com. mine works perfectly.
Sent from Yahoo Mail on Android
On Tue, Nov 13, 2018 at 5:56 PM, Charlie England <ceengland7@gmail.com> w
rote: Anyone have experience with the recent ebay offerings for cheap l
ab supplies? Example below. I tried searching my old AEC emails, but the mo
st 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.=C2- 0-30v/0-10a bench supp
ly
Thanks,
Charlie
--
=9CBlessed are the cracked, for they shall let in the light.=9D
=C2-=C2-Groucho Marx
| | Virus-free. www.avast.com |
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Subject: | Re: Cheap bench supply? |
Bingo=2E Ability to adjust voltage and limit current can minimize damage if
somethings not right=2E Biggest exception is 'switcher' power supplies; th
ey are trickier to test that way=2E
=81=A3Charlie=8B
On Nov 14,
2018, 8:24 AM, at 8:24 AM, Ernest Christley <echristley@att=2Enet> wrote:
>
Several reasons, John=2E
>1) Powering avionics will not be the only reason
I ever need a power
>supply=2E=C2- I've used the one I bought for severa
l other electronics
>projects that required different voltages=2E
>2) You c
an ramp down the voltage to see where a particular instrument
>stops workin
g=2E=C2- Useful for planning alternator out situations=2E
>3) The ability
to limit current allows you to safely test
>"experimental" electronics=2E
=C2- Apply voltage at 1/2 an amp will let you
>test a circuit that may ha
ve=C2- a short=2E
>
>On Wednesday, November 14, 2018, 4:03:06 AM EST, Joh
n Tipton
><john@tiptonuk=2Eeu> wrote:
>
>What=99s wrong with a
=98cb=99 type radio power supply, 13=2E8 volts, 3-5 amps,
>why do
you need something giving variable volts/amps, are you really
>going to tes
t your expensive electronics by playing around with varying
>these outputs
=94-
>John
>
>Sent from my iPad
>=C2- =C2- =C2-----x--O--x----
>On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail=2Ecom>
>wrot
e:
>
>
>
>Thanks, to Richard, Earnest and Bob=2E Looks like I need to go a
head &
>pull the trigger=2E I'll report when it comes in=2E
>
> Charlie
>
> On 11/13/2018 7:47 PM, Richard Girard wrote:
>
>
> Charlie, this is t
he one I bought on Amazon=2E =2E=C2-
>https://www=2Eamazon=2Ecom/Dr-mete
r-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?i
e=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply
>
> Ri
ck Girard
>On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian=2Elester@
gmail=2Ecom>
>wrote:
>
>A bit more expensive but I got this from amazon
=2E DC Power Supply
>Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable S
witching
>Regulated Power Supply Digital
> https://www=2Eamazon=2Ecom/dp/B0
73TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
>
>But honestly the stuff on e
Bay looks about the same at a better price=2E
> -Brian
>On Tue, Nov 13, 2
018 at 6:44 PM Charlie England <ceengland7@gmail=2Ecom>
>wrote:
>
> Than
ks, Ernest=2E Anyone else?
>On Tue, Nov 13, 2018 at 5:18 PM Ernest Christ
ley <echristley@att=2Enet>
>wrote:
>
>Looks very much like the onei bough
t from mpja=2Ecom=2E mine works
>perfectly=2E
>
> Sent from Yahoo Mail on
Android
>
>On Tue, Nov 13, 2018 at 5:56 PM, Charlie England <ceengland7@g
mail=2Ecom>
>wrote: Anyone have experience with the recent ebay offerin
gs for
>cheap lab supplies? Example below=2E I tried searching my old AEC e
mails,
>but the most recent reference I found was for a much more expensive
>model=2E It'll get minimal use; just final checkout of my project's
>wir
ing and then rare uses after that, so don't want to spend
>$hundreds=2E=C2
- 0-30v/0-10a bench supply
>
> Thanks,
> Charlie
>
>
>
>
>
> --
>
>=9CBlessed are the cracked, for they shall let in
the light=2E=9D =C2-=C2-Groucho
>Marx
>
>
>
>
>| | Vir
us-free=2E www=2Eavast=2Ecom |
>
>
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Subject: | Re: Cheap bench supply? |
I have been thinking of getting one of these as well but a 30V 20A model. I
have used one before but I'm not entirely sure how they work. What is the
function on the amperage dial? In what situation would you set it lower
than the maximum output of the power supply?
On Wed, Nov 14, 2018, 04:06 John Tipton <john@tiptonuk.eu wrote:
> What=99s wrong with a =98cb=99 type radio power supply,
13.8 volts, 3-5 amps,
> why do you need something giving variable volts/amps, are you really goin
g
> to test your expensive electronics by playing around with varying these
> outputs =94-
>
> John
>
> Sent from my iPad
>
> ----x--O--x----
>
> On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com> wrote:
>
> Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull
> the trigger. I'll report when it comes in.
>
> Charlie
>
> On 11/13/2018 7:47 PM, Richard Girard wrote:
>
> Charlie, this is the one I bought on Amazon. .
>
>
> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ
ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword
s=bench+power+supply
>
> Rick Girard
>
> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian.lester@gmail.com>
> wrote:
>
>> A bit more expensive but I got this from amazon. DC Power Supply
>> Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated
>> Power Supply Digital
>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
>>
>> But honestly the stuff on eBay looks about the same at a better price.
>> -Brian
>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England <ceengland7@gmail.com>
>> wrote:
>>
>>> Thanks, Ernest. Anyone else?
>>>
>>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley <echristley@att.net>
>>> wrote:
>>>
>>>> Looks very much like the onei bought from mpja.com. mine works
>>>> perfectly.
>>>>
>>>> Sent from Yahoo Mail on Android
>>>> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_Y
Growth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2
=Global_YGrowth&af_sub3=EmailSignature>
>>>>
>>>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England
>>>> <ceengland7@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 ge
t
>>>> 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-Adjusta
ble-Lab-Bench-Test-Equipment-Tool/202435783331?ssPageName=STRK%3AMEBIDX%3
AIT&_trksid=p2060353.m1438.l2649>
>>>>
>>>> Thanks,
>>>>
>>>> Charlie
>>>>
>>>>
>
> --
> =9CBlessed are the cracked, for they shall let in the light.
=9D Groucho Marx
> <http://www.goodreads.com/author/show/43244.Groucho_Marx>
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm
_campaign=sig-email&utm_content=emailclient&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=emailclient&utm_term=link>
> <#m_-7689733828043912502_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
>
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Subject: | Re: Cheap bench supply? |
For my purposes at the moment, the current setting would be used to
minimize risk of catastrophic failure in a device that's polarity
sensitive, such as electronics, or possibly external stuff around a DC
motor that might get hooked up backward. The way I'd use it is to set
voltage to zero, and current to some relatively low percentage of a
given device's max current draw. Apply power to the device, and slowly
increase voltage while monitoring current and the device 'waking up'.
The current limiter may well reduce the voltage below set point, to
control current, if there's an 'issue'. If everything's nominal at
normal 12-14V, then current limit can be raised to the device's normal
operating current to check operation.
I've used simple variable voltage supplies for decades when
troubleshooting or checking devices (mostly audio gear), but without the
current limiter, the operator (me) becomes the detector/limiter, and may
not be perceptive or quick-reacting enough to avoid damage. I'm getting
lazy in my slower response time old age. :-)
If you decide to roll your own LED landing lights, for example, a
variable voltage/current supply could conceivably be used to experiment
with various high power LEDs before buying a dedicated LED driver board.
As I mentioned earlier, the only thing I can think of that would be
tougher to test this way would be electronics with 'switcher' power
supplies. The switcher will try to draw as much current as it needs, to
make full output, and may tend to be either full off (inadequate supply
current) or full on, so the current/voltage monitoring technique may
prove meaningless with some of those devices. Even with those devices,
we can at least check that we have polarity correct and on the correct
pin(s).
Charlie
On 11/14/2018 9:55 AM, Sebastien wrote:
> I have been thinking of getting one of these as well but a 30V 20A
> model. I have used one before but I'm not entirely sure how they work.
> What is the function on the amperage dial? In what situation would you
> set it lower than the maximum output of the power supply?
>
> On Wed, Nov 14, 2018, 04:06 John Tipton <john@tiptonuk.eu
> <mailto:john@tiptonuk.eu> wrote:
>
> Whats wrong with a cb type radio power supply, 13.8 volts, 3-5
> amps, why do you need something giving variable volts/amps, are
> you really going to test your expensive electronics by playing
> around with varying these outputs -
>
> John
>
> Sent from my iPad
>
> ----x--O--x----
>
> On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com
> <mailto:ceengland7@gmail.com>> wrote:
>
>> Thanks, to Richard, Earnest and Bob. Looks like I need to go
>> ahead & pull the trigger. I'll report when it comes in.
>>
>> Charlie
>>
>> On 11/13/2018 7:47 PM, Richard Girard wrote:
>>> Charlie, this is the one I bought on Amazon. .
>>>
>>> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply
>>>
>>> Rick Girard
>>>
>>> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester
>>> <brian.lester@gmail.com <mailto:brian.lester@gmail.com>> wrote:
>>>
>>> A bit more expensive but I got this from amazon. DC Power
>>> Supply Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable
>>> Switching Regulated Power Supply Digital
>>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
>>>
>>> But honestly the stuff on eBay looks about the same at a
>>> better price.
>>> -Brian
>>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England
>>> <ceengland7@gmail.com <mailto:ceengland7@gmail.com>> wrote:
>>>
>>> Thanks, Ernest. Anyone else?
>>>
>>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley
>>> <echristley@att.net <mailto:echristley@att.net>> wrote:
>>>
>>> Looks very much like the onei bought from mpja.com
>>> <http://mpja.com>. mine works perfectly.
>>>
>>> Sent from Yahoo Mail on Android
>>> <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
>>>
>>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England
>>> <ceengland7@gmail.com
>>> <mailto:ceengland7@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
>>>
>>>
>>>
>>> --
>>>
>>>
>>> Blessed are the cracked, for they shall let in the light.
>>> Groucho Marx
>>> <http://www.goodreads.com/author/show/43244.Groucho_Marx>
>>>
>>>
>>
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&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=emailclient&utm_term=link>
>>
>>
>> <#m_-7689733828043912502_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
---
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Message 7
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Subject: | Re: Cheap bench supply? |
Yes. You can turn the current down so that no matter the voltage, you only
get a set amount of current.
Sent from Yahoo Mail on Android
On Wed, Nov 14, 2018 at 10:58 AM, Sebastien<cluros@gmail.com> wrote: I
have been thinking of getting one of these as well but a 30V 20A model. I h
ave used one before but I'm not entirely sure how they work. What is the fu
nction on the amperage dial? In what situation would you set it lower than
the maximum output of the power supply?
On Wed, Nov 14, 2018, 04:06 John Tipton <john@tiptonuk.eu wrote:
What=99s wrong with a =98cb=99 type radio power supply, 1
3.8 volts, 3-5 amps, why do you need something giving variable volts/amps,
are you really going to test your expensive electronics by playing around w
ith varying these outputs =94-
John
Sent from my iPad
=C2- =C2- =C2-----x--O--x----
On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com> wrote:
Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull
the trigger. I'll report when it comes in.
Charlie
On 11/13/2018 7:47 PM, Richard Girard wrote:
Charlie, this is the one I bought on Amazon. .=C2-
https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ
ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword
s=bench+power+supply
Rick Girard
On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian.lester@gmail.com> wro
te:
A bit more expensive but I got this from amazon. DC Power Supply Variable,0
-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply
Digital
https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
But honestly the stuff on eBay looks about the same at a better price.
-Brian
On Tue, Nov 13, 2018 at 6:44 PM Charlie England <ceengland7@gmail.com> wr
ote:
Thanks, Ernest. Anyone else?
On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley <echristley@att.net> wro
te:
Looks very much like the onei bought from mpja.com. mine works perfectly.
Sent from Yahoo Mail on Android
On Tue, Nov 13, 2018 at 5:56 PM, Charlie England <ceengland7@gmail.com> w
rote: Anyone have experience with the recent ebay offerings for cheap l
ab supplies? Example below. I tried searching my old AEC emails, but the mo
st 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.=C2- 0-30v/0-10a bench supp
ly
Thanks,
Charlie
--
=9CBlessed are the cracked, for they shall let in the light.=9D
=C2-=C2-Groucho Marx
| | Virus-free. www.avast.com |
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Subject: | Re: Cheap bench supply? |
Charlie, I bought two of these units back in June from a different Ebay vendor.
The only issue I had was an intermittent connection in the line cord at P/S
end of one unit. It uses a standard computer line cord, so I just replaced it
with one I had laying around. It works as advertised and its a good value.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=485014#485014
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Subject: | Re: Cheap bench supply? |
On 11/14/2018 12:11 PM, MMiller wrote:
>
> Charlie, I bought two of these units back in June from a different Ebay vendor.
The only issue I had was an intermittent connection in the line cord at P/S
end of one unit. It uses a standard computer line cord, so I just replaced it
with one I had laying around. It works as advertised and its a good value.
>
Sounds good.
Thanks for the 'PIREP'; I've got one on the way.
Charlie
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Subject: | Re: Cheap bench supply? |
I am careful about buying electronic equipment like battery chargers and power
supplies.
The very inexpensive stuff Is built from inexpensive parts which may fail fairly
quickly.
It this kind of equipment fails in the max voltage mode, it can FRY some very expensive
equipment being powered or tested in short order. A battery charger
that fails in an over voltage mode can COOK a very expensive battery quickly.
I have wondered the streets of some of the third world countries and seen some
of the "SURPLUS" electronic parts that often go into cheap test equipment. This
was a real eye opener experience.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com <owner-aeroelectric-list-server@matronics.com>
On Behalf Of MMiller
Sent: Wednesday, November 14, 2018 12:12 PM
Subject: AeroElectric-List: Re: Cheap bench supply?
Charlie, I bought two of these units back in June from a different Ebay vendor.
The only issue I had was an intermittent connection in the line cord at P/S
end of one unit. It uses a standard computer line cord, so I just replaced it
with one I had laying around. It works as advertised and its a good value.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=485014#485014
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Subject: | Re: Cheap bench supply? |
The current adjustment sets an upper bound on the current the unit will supply.
If you try to draw more current than that, the output voltage falls far enough
that the current stays at the limit you set.
You can use PSUs with a current limiting facility in either of two modes. Either
constant voltage, which is what is normally used, or constant current mode.
There are not many circuits that need a constant current drive, but I used to
use one for charging NiCd batteries (in the olden days) where the current would
be set at (say) 5x the one hour cell capacity and I could charge four or more
cells in series. The terminal voltage would start low, and automatically rise
as the cells charged.
>>In what situation would you set it lower than the maximum output of the power
supply?
When you have a circuit that needs a constant current supply, or, as someone suggested,
when you have a circuit which, should a fault develop, you want to limit
the maximum power your supply can generate.
On Nov 14, 2018, at 10:55 AM, Sebastien <cluros@gmail.com> wrote:
I have been thinking of getting one of these as well but a 30V 20A model. I have
used one before but I'm not entirely sure how they work. What is the function
on the amperage dial? In what situation would you set it lower than the maximum
output of the power supply?
On Wed, Nov 14, 2018, 04:06 John Tipton <john@tiptonuk.eu wrote:
Whats wrong with a cb type radio power supply, 13.8 volts, 3-5 amps, why do you
need something giving variable volts/amps, are you really going to test your
expensive electronics by playing around with varying these outputs -
John
Sent from my iPad
----x--O--x----
On 14 Nov 2018, at 3:11 am, Charlie England <ceengland7@gmail.com> wrote:
> Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull the
trigger. I'll report when it comes in.
>
> Charlie
>
> On 11/13/2018 7:47 PM, Richard Girard wrote:
>> Charlie, this is the one I bought on Amazon. .
>>
>> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply
>>
>> Rick Girard
>>
>> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester <brian.lester@gmail.com> wrote:
>> A bit more expensive but I got this from amazon. DC Power Supply Variable,0-30
V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply Digital
>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P
>>
>> But honestly the stuff on eBay looks about the same at a better price.
>> -Brian
>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England <ceengland7@gmail.com> wrote:
>> Thanks, Ernest. Anyone else?
>>
>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley <echristley@att.net> wrote:
>> Looks very much like the onei bought from mpja.com. mine works perfectly.
>>
>> Sent from Yahoo Mail on Android
>>
>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England
>> <ceengland7@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
>>
>> Thanks,
>>
>> Charlie
>>
>>
>> --
>> Blessed are the cracked, for they shall let in the light. Groucho Marx
>>
>>
>
>
> Virus-free. www.avast.com
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Subject: | Re: Cheap bench supply? |
At 04:00 PM 11/14/2018, you wrote:
>
>I am careful about buying electronic equipment like battery chargers
>and power supplies.
>
>The very inexpensive stuff Is built from inexpensive parts which may
>fail fairly quickly.
>
>It this kind of equipment fails in the max voltage mode, it can FRY
>some very expensive equipment being powered or tested in short
>order. A battery charger that fails in an over voltage mode can
>COOK a very expensive battery quickly.
>
>I have wondered the streets of some of the third world countries and
>seen some of the "SURPLUS" electronic parts that often go into cheap
>test equipment. This was a real eye opener experience.
I can't speak from any documentable source
but I believe your concerns are becoming
less significant if not non-existant.
The ability of industries to fabricate
and utilize perfectly acceptable parts
has been falling exponentially for some
time. The handling $COST$ of processing
sub-standard parts into products can
easily exceed the cost of 'good' parts.
Ergo, for the vast majority of examples
on the market, I've found that the offerings
are of good value. Out here in the
hinterlands of western Kansas, my
FIRST choice for on-line shopping is
eBay, not necessarily because it has
proven to be 'better' than any other
source . . . only adequate to my needs.
Vendors with high percentages of satisfactory
customers over hundreds if not thousands
of transactions have proven to be very
low if not zero risk.
Bob . . .
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