Re: [Elecraft] Walwarts - linear supplies

[Victor Rosenthal 4X6GP]

I've added regulators and (when needed) rectifiers to wallwarts. I just 
put the components on a piece of perfboard, cut the wire, hook it up and 
tape the board to the wart. Presto, a regulated linear wallwart.



73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 21 Nov 2017 10:43, Jim Brown wrote:

On 11/20/2017 5:50 PM, Brian Hunt wrote:
Be careful using the non-regulated linear wall warts. The open circuit 
voltage can be more than 16 VDC and could be harmful to gear not rated 
that high.


Yes and no.  The vast majority of linear wall warts are UN-regulated, 
but the current drawn by the equipment being powered significantly 
reduces the output voltage, usually to the rated value. That's how 
linear, unregulated power supplies work. That's why it's good to match 
both rated voltage and current. AND -- most equipment will tolerate 
moderate over-voltage. The K3, for example, is rated for 15VDC max.


And, or course, not all gear runs on 12VDC -- lots of stuff runs on 5V, 
7.5V, 9V, and 14V.



Best to measure OC first!


Measuring OC is a good thing, and EXPECT to see 25-30% higher voltage 
than rated. But what matters is the voltage under load. And that's why 
my applications note recommends putting Power Poles on both the wart and 
the connector to the equipment, then sticking a voltage monitor in line 
with the equipment connected. You did read the link I posted, didn't 
you?  :)


73, Jim K9YC

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Re: [Elecraft] Walwarts - linear supplies

[Larry (K8UT)]

Two years ago, I embarked on a "wallwart-ectomy" in my shack, removing 
all wall warts and replacing them with DC power cords that connected to 
fused dc power strips, connected to a single shack linear supply. Band 
decoder, PC speakers, SDR Rx, wavenode wattmeter... none of those items 
have their own power source any more.



-larry (K8UT)

-- Original Message --
From: "Joe Subich, W4TV" <li...@subich.com>
To: elecraft@mailman.qth.net
Sent: 2017-11-20 16:17:02
Subject: Re: [Elecraft] Walwarts - linear supplies



All Electroncs (www.allelectronics.com) has analog wall warts of 
various

voltage/current capability depending on what is available in surplus at
any given time.  One may not even need regulated voltage as many 
devices

contain internal regulators ...

They presently show 12 V @ 500 mA and 12.5V @ 410 mA units that appear
to be analog for less than $5.00 each in Q=1.

73,

  ... Joe, W4TV


On 11/20/2017 3:37 PM, N2TK, Tony wrote:

I believe recently there was talk about noise from walwarts.  Jameco
Reliapro offers a line of linear regulated walwarts. They are 
reasonable in

price and so far noise free.

They range from 2-24VDC with .2-1A output.

N2TK, Tony

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Re: [Elecraft] Walwarts - linear supplies

[Jim Brown]

On 11/20/2017 5:50 PM, Brian Hunt wrote:

Be careful using the non-regulated linear wall warts. The open circuit voltage 
can be more than 16 VDC and could be harmful to gear not rated that high.


Yes and no.  The vast majority of linear wall warts are UN-regulated, 
but the current drawn by the equipment being powered significantly 
reduces the output voltage, usually to the rated value. That's how 
linear, unregulated power supplies work. That's why it's good to match 
both rated voltage and current. AND -- most equipment will tolerate 
moderate over-voltage. The K3, for example, is rated for 15VDC max.


And, or course, not all gear runs on 12VDC -- lots of stuff runs on 5V, 
7.5V, 9V, and 14V.



Best to measure OC first!


Measuring OC is a good thing, and EXPECT to see 25-30% higher voltage 
than rated. But what matters is the voltage under load. And that's why 
my applications note recommends putting Power Poles on both the wart and 
the connector to the equipment, then sticking a voltage monitor in line 
with the equipment connected. You did read the link I posted, didn't 
you?  :)


73, Jim K9YC

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Re: [Elecraft] Walwarts - linear supplies

[Brian Hunt]

Be careful using the non-regulated linear wall warts. The open circuit voltage 
can be more than 16 VDC and could be harmful to gear not rated that high. Best 
to measure OC first!

73, 
Brian, K0DTJ
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Re: [Elecraft] Walwarts - linear supplies

[Ron D'Eau Claire]

I have a several linear wall-warts that I collected over the years which I 
guard jealously. 

However a few of them are only a transformer and provide low-voltage AC to the 
equipment. The rectifiers were included in the item being powered. 

73, Ron AC7AC

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, November 20, 2017 1:42 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Walwarts - linear supplies

Older wall warts are linear.  If you're smart enough to have saved them, 
there's a good chance you won't have buy anything.  Simply select one with the 
matching voltage and rated for the needed current, cut the cables to both old 
and new warts, splice the old wart to the connector that mates with the unit 
you need to power.

Older warts are often available at second hand stores and flea markets. 
$1 is the going rate. In general, linear warts are much heavier than SMPS 
units, so that's a good first check. A better one is to plug it into AC and 
hold a portable radio next to it tuned somewhere near 2 MHz (like the top of 
the AM BC band). If you hear hash, it's a switcher. If you don't., 99% chance 
that it's linear.

All of this is described in http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On 11/20/2017 1:17 PM, Joe Subich, W4TV wrote:
> All Electroncs (www.allelectronics.com) has analog wall warts of 
> various voltage/current capability depending on what is available in 
> surplus at any given time.  One may not even need regulated voltage as 
> many devices contain internal regulators ...


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Re: [Elecraft] Walwarts - linear supplies

[N2TK, Tony]

Jim,
Good tip. I want to try that with some of my old walwarts
N2tK, Tony

-Original Message-
From: elecraft-boun...@mailman.qth.net 
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, November 20, 2017 4:42 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Walwarts - linear supplies

Older wall warts are linear.  If you're smart enough to have saved them, 
there's a good chance you won't have buy anything.  Simply select one with the 
matching voltage and rated for the needed current, cut the cables to both old 
and new warts, splice the old wart to the connector that mates with the unit 
you need to power.

Older warts are often available at second hand stores and flea markets. 
$1 is the going rate. In general, linear warts are much heavier than SMPS 
units, so that's a good first check. A better one is to plug it into AC and 
hold a portable radio next to it tuned somewhere near 2 MHz (like the top of 
the AM BC band). If you hear hash, it's a switcher. If you don't., 99% chance 
that it's linear.

All of this is described in http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On 11/20/2017 1:17 PM, Joe Subich, W4TV wrote:
> All Electroncs (www.allelectronics.com) has analog wall warts of 
> various voltage/current capability depending on what is available in 
> surplus at any given time.  One may not even need regulated voltage as 
> many devices contain internal regulators ...


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Re: [Elecraft] Walwarts - linear supplies

[Jim Brown]

Older wall warts are linear.  If you're smart enough to have saved them, 
there's a good chance you won't have buy anything.  Simply select one 
with the matching voltage and rated for the needed current, cut the 
cables to both old and new warts, splice the old wart to the connector 
that mates with the unit you need to power.


Older warts are often available at second hand stores and flea markets. 
$1 is the going rate. In general, linear warts are much heavier than 
SMPS units, so that's a good first check. A better one is to plug it 
into AC and hold a portable radio next to it tuned somewhere near 2 MHz 
(like the top of the AM BC band). If you hear hash, it's a switcher. If 
you don't., 99% chance that it's linear.


All of this is described in http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On 11/20/2017 1:17 PM, Joe Subich, W4TV wrote:

All Electroncs (www.allelectronics.com) has analog wall warts of various
voltage/current capability depending on what is available in surplus at
any given time.  One may not even need regulated voltage as many devices
contain internal regulators ... 



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Re: [Elecraft] Walwarts - linear supplies

[Joe Subich, W4TV]

All Electroncs (www.allelectronics.com) has analog wall warts of various
voltage/current capability depending on what is available in surplus at
any given time.  One may not even need regulated voltage as many devices
contain internal regulators ...

They presently show 12 V @ 500 mA and 12.5V @ 410 mA units that appear
to be analog for less than $5.00 each in Q=1.

73,

   ... Joe, W4TV


On 11/20/2017 3:37 PM, N2TK, Tony wrote:

I believe recently there was talk about noise from walwarts.  Jameco
Reliapro offers a line of linear regulated walwarts. They are reasonable in
price and so far noise free.

They range from 2-24VDC with .2-1A output.

N2TK, Tony

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Re: [Elecraft] Walwarts - linear supplies

[JT Croteau]

They are nice warts Tony.  I have a 1A 12VAC Jameco Reliapro wallwart
for my beverage direction controller.  It is extremely clean and noise
free.

73
N1ESE

On Mon, Nov 20, 2017 at 3:37 PM, N2TK, Tony  wrote:
> I believe recently there was talk about noise from walwarts.  Jameco
> Reliapro offers a line of linear regulated walwarts. They are reasonable in
> price and so far noise free.
>
> They range from 2-24VDC with .2-1A output.
>
> N2TK, Tony
>
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[Elecraft] Walwarts - linear supplies

[N2TK, Tony]

I believe recently there was talk about noise from walwarts.  Jameco
Reliapro offers a line of linear regulated walwarts. They are reasonable in
price and so far noise free.

They range from 2-24VDC with .2-1A output.

N2TK, Tony

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