Looking for miniature 14-V power supply for travel use

[N8LP]

Look through your old laptop PC power supplies. They are typically 14-19
VDC with 1.5-2.2 A current supply capability. Some are clean, some are
dirty, but they are generally quite small. I used to use one with my K2
at trade shows.

Larry N8LP


On 7/5/2011 12:00 PM, [hidden email] wrote:

> Date: Mon, 4 Jul 2011 14:23:14 -0700
> From: Wayne Burdick<[hidden email]>
> Subject: [Elecraft] Looking for miniature 14-V power supply for travel
> use
> To: Elecraft Reflector<[hidden email]>
> Message-ID:<[hidden email]>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[ARRL - N6MQL]

Wayne,

The following supply meets your requirements almost to the Tee. There
are 3 to choose from. I have tested and used the second one in
Professional broadcast & off-line Video production as well as Audio
recording.  I have not heard noise from them that would cause an issue.  
Furthermore, I have used these with my KX1 and the K3 when having fun on
vacation. Specs can be found at http://us.tdk-lambda.com

Lambda - LS25-12 (LS35-12) - $16.50 ($18.25) Newark electronics - 3.1" X
5.0" X 1.1" (3.9" X 3.2" X 1.4") - 10.8V-13.2V @ 2.1A (3.0A)

Lambda - HWS30-12/A - $54 Newark electronics - 1.24" X 3.23" X 3.74"  
9.6V - 14.4V @ 2.5A

Now, if you really want to go crazy with this! (and I know some of you
out there will)

Lambda - PFE300S-12 - $250.00 Newark electronics  - 2.4" X 0.5" X 4.6"  
9.6V - 14.4V @ 25A (YES 25A !)

Have fun, and enjoy your holidays

Michael
N6MQL

> Message: 9
> Date: Mon, 4 Jul 2011 14:23:14 -0700
> From: Wayne Burdick<[hidden email]>
> Subject: [Elecraft] Looking for miniature 14-V power supply for travel
> use
> To: Elecraft Reflector<[hidden email]>
> Message-ID:<[hidden email]>
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>    

--
Michael Aretsky
N6MQL

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Chip Stratton]

Looks like the LS25-15 model might be what Wayne (and I) would like, since
it is adjustable from 13.5V
 to 15V at 1.7 A, whereas the LS25-12 is adjustable from 10.8V to 13.2V.

These are speced at 120 mV ripple noise. Is that high?

Thanks for posting this Michael.

Chip

On Tue, Jul 5, 2011 at 7:45 PM, N6MQL <[hidden email]> wrote:

> Wayne,
>
> The following supply meets your requirements almost to the Tee. There
> are 3 to choose from. I have tested and used the second one in
> Professional broadcast & off-line Video production as well as Audio
> recording.  I have not heard noise from them that would cause an issue.
> Furthermore, I have used these with my KX1 and the K3 when having fun on
> vacation. Specs can be found at http://us.tdk-lambda.com
>
> Lambda - LS25-12 (LS35-12) - $16.50 ($18.25) Newark electronics - 3.1" X
> 5.0" X 1.1" (3.9" X 3.2" X 1.4") - 10.8V-13.2V @ 2.1A (3.0A)
>
> Lambda - HWS30-12/A - $54 Newark electronics - 1.24" X 3.23" X 3.74"
> 9.6V - 14.4V @ 2.5A
>
> Now, if you really want to go crazy with this! (and I know some of you
> out there will)
>
> Lambda - PFE300S-12 - $250.00 Newark electronics  - 2.4" X 0.5" X 4.6"
> 9.6V - 14.4V @ 25A (YES 25A !)
>
> Have fun, and enjoy your holidays
>
> Michael
> N6MQL
>
>
> > Message: 9
> > Date: Mon, 4 Jul 2011 14:23:14 -0700
> > From: Wayne Burdick<[hidden email]>
> > Subject: [Elecraft] Looking for miniature 14-V power supply for travel
> >       use
> > To: Elecraft Reflector<[hidden email]>
> > Message-ID:<[hidden email]>
> > Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
> >
> > I'm going to take a KX3 with me on vacation this summer, and I like to
> > travel light. I'll have internal batteries for field operation, but
> > for indoor use, I'm hoping to find a miniature power supply that meets
> > these criteria:
> >
> > - very small (say 4 x 3 x 1 inches)
> > - light weight (less than 1 lb)
> > - 2 A min. peak output current
> > - 13 to 14 VDC output voltage
> > - input AC voltage range of 100-130 V
> > - low noise
> >
> > I'm sure it will have to be a switching supply. The question is
> > whether any exist with this form-factor that are also quiet from an RF
> > perspective.
> >
> > Anyone know of such a unit?
> >
> > 73,
> > Wayne
> > N6KR
> >
>
> --
> Michael Aretsky
> N6MQL
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Eugene Balinski]

Have you looked at the one from Powerwerx ?

http://www.powerwerx.com/batteries-chargers/powerwerx-30-amp-desktop-switching-power-supply-powerpoles.html

73,
K1NR


On Tue, 05 Jul 2011 17:45:01 -0700
 N6MQL <[hidden email]> wrote:

> Wayne,
>
> The following supply meets your requirements almost to
> the Tee. There
> are 3 to choose from. I have tested and used the second
> one in
> Professional broadcast & off-line Video production as
> well as Audio
> recording.  I have not heard noise from them that would
> cause an issue.  
> Furthermore, I have used these with my KX1 and the K3
> when having fun on
> vacation. Specs can be found at http://us.tdk-lambda.com
>
> Lambda - LS25-12 (LS35-12) - $16.50 ($18.25) Newark
> electronics - 3.1" X
> 5.0" X 1.1" (3.9" X 3.2" X 1.4") - 10.8V-13.2V @ 2.1A
> (3.0A)
>
> Lambda - HWS30-12/A - $54 Newark electronics - 1.24" X
> 3.23" X 3.74"  
> 9.6V - 14.4V @ 2.5A
>
> Now, if you really want to go crazy with this! (and I
> know some of you
> out there will)
>
> Lambda - PFE300S-12 - $250.00 Newark electronics  - 2.4"
> X 0.5" X 4.6"  
> 9.6V - 14.4V @ 25A (YES 25A !)
>
> Have fun, and enjoy your holidays
>
> Michael
> N6MQL
>
>
> > Message: 9
> > Date: Mon, 4 Jul 2011 14:23:14 -0700
> > From: Wayne Burdick<[hidden email]>
> > Subject: [Elecraft] Looking for miniature 14-V power
> supply for travel
> > use
> > To: Elecraft Reflector<[hidden email]>
> >
>

Message-ID:<[hidden email]>

> > Content-Type: text/plain; charset=US-ASCII;
> format=flowed; delsp=yes
> >
> > I'm going to take a KX3 with me on vacation this
> summer, and I like to
> > travel light. I'll have internal batteries for field
> operation, but
> > for indoor use, I'm hoping to find a miniature power
> supply that meets
> > these criteria:
> >
> > - very small (say 4 x 3 x 1 inches)
> > - light weight (less than 1 lb)
> > - 2 A min. peak output current
> > - 13 to 14 VDC output voltage
> > - input AC voltage range of 100-130 V
> > - low noise
> >
> > I'm sure it will have to be a switching supply. The
> question is
> > whether any exist with this form-factor that are also
> quiet from an RF
> > perspective.
> >
> > Anyone know of such a unit?
> >
> > 73,
> > Wayne
> > N6KR
> >    
>
> --
> Michael Aretsky
> N6MQL
>
>

______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list:
> http://www.qsl.net/donate.html

---------------------------------------------------------------------
Web mail provided by NuNet, Inc. The Premier National provider.
http://www.nni.com/
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Ralph Parker]

>Have you looked at the one from Powerwerx ?
>http://www.powerwerx.com/batteries-chargers/powerwerx-30-amp-desktop-switch
ing-power-supply-powerpoles.html

I bought one. Not exactly miniature, but smaller than my Samlex 1223.
Runs the K3 + accessories easily. No noise issues (RF or acoustic) that I
could tell. I don't have a P3 (yet), but I'll betcha it'll fit inside that
case.

Ralph, VE7XF


______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Ross Primrose N4RP]

The power supplies that typically come with external HD enclosures and
external CD/DVD drives should fit the bill quite nicely if they're quiet
enough, generally 12V at 2-2.5A. I've tried several, and havn't noticed
any significant noise with any of the ones I've used.

73, Ross N4RP

On 7/4/2011 5:23 PM, Wayne Burdick wrote:

> I'm going to take a KX3 with me on vacation this summer, and I like to
> travel light. I'll have internal batteries for field operation, but
> for indoor use, I'm hoping to find a miniature power supply that meets
> these criteria:
>
> - very small (say 4 x 3 x 1 inches)
> - light weight (less than 1 lb)
> - 2 A min. peak output current
> - 13 to 14 VDC output voltage
> - input AC voltage range of 100-130 V
> - low noise
>
> I'm sure it will have to be a switching supply. The question is
> whether any exist with this form-factor that are also quiet from an RF
> perspective.
>
> Anyone know of such a unit?
>
> 73,
> Wayne
> N6KR
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

--
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Rick McClelland, AA5S]

This brings a thought to mind, if I may briefly hijack this post.  Is it
acceptable to connect a Powerwerx 30 amp supply in parallel with a Gamma
HPS1-a supply in order to increase the current/surge capacity of the
Powerwerx supply?  This seems reasonable in theory but I don't know if the
two supplies might deliver slightly different voltages causing the regulator
on one to malfunction or fail.

Rick

On Tue, Jul 5, 2011 at 10:26 PM, Ralph Parker <[hidden email]> wrote:

> >Have you looked at the one from Powerwerx ?
> >
> http://www.powerwerx.com/batteries-chargers/powerwerx-30-amp-desktop-switch
> ing-power-supply-powerpoles.html
>
> I bought one. Not exactly miniature, but smaller than my Samlex 1223.
> Runs the K3 + accessories easily. No noise issues (RF or acoustic) that I
> could tell. I don't have a P3 (yet), but I'll betcha it'll fit inside that
> case.
>
> Ralph, VE7XF
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--
Rick McClelland, AA5S
Fort Collins, CO
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[John Ragle]

Hi, Rick...

     Connecting two power supplies in parallel is not quite as
straightforward as one might think at first glance...I suggest you
Google "Power Supplies in Parallel" -- you will get a good sized
fist-full of hits on this subject.

John Ragle -- W1ZI

=====

On 7/6/2011 12:24 PM, Rick McClelland, AA5S wrote:
> This brings a thought to mind, if I may briefly hijack this post.  Is it
> acceptable to connect a Powerwerx 30 amp supply in parallel with a Gamma
> HPS1-a supply in order to increase the current/surge capacity of the
> Powerwerx supply?  This seems reasonable in theory but I don't know if the
> two supplies might deliver slightly different voltages causing the regulator
> on one to malfunction or fail.
>
> Rick

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Rick McClelland, AA5S]

Doh!  Good tip, sorry for the bandwidth.

Rick

On Wed, Jul 6, 2011 at 10:31 AM, John Ragle <[hidden email]> wrote:

> Hi, Rick...
>
>     Connecting two power supplies in parallel is not quite as
> straightforward as one might think at first glance...I suggest you
> Google "Power Supplies in Parallel" -- you will get a good sized
> fist-full of hits on this subject.
>
> John Ragle -- W1ZI
>
> =====
>
> On 7/6/2011 12:24 PM, Rick McClelland, AA5S wrote:
> > This brings a thought to mind, if I may briefly hijack this post.  Is it
> > acceptable to connect a Powerwerx 30 amp supply in parallel with a Gamma
> > HPS1-a supply in order to increase the current/surge capacity of the
> > Powerwerx supply?  This seems reasonable in theory but I don't know if
> the
> > two supplies might deliver slightly different voltages causing the
> regulator
> > on one to malfunction or fail.
> >
> > Rick
>
>  ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--
Rick McClelland, AA5S
Fort Collins, CO
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[AD6XY]

Hi Wayne,

I expect you are back by now. However it might still be of interest. I have been using laptop type supplies for this application. Light, small, cheap and some of them are relatively quiet. They will also fit in a small metal box. Recently I came across LED lighting supplies, 12V again and similar to laptops except they come with standard 2.1mm plugs.

For quiet and off grid applications, I use LiPo batteries, 3 or 4 cell. For the KX3, 3 cells will do and can be re-charged with a cheap balance charger. I have a small one to hand, 20x40x100mm 2.2Ah and a 4AH 4 cell 20x50x120mm.

My own application is powering portable microwave gear, but 12V is universal. Fusing is essential of course as these cells will happily deliver 60Amps. They have a reputation for danger if you miss-charge them. But people still fill up their cars with gasolene to go on holiday and that is much more dangerous.

Mike