Elecraft

Pro Audio PS

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JP Douglas

Pro Audio PS

Hi all,

I have one as well for my KX3, I've even taken it with me on holidays to the Caribbean were voltage is 240 volts, still plug and play, works on 120 or 240 volts. Excellent product though in the shack I run the KX3 on battery/solar power.

73 de Jose Douglas KB1TCD

Sent from my iPad
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Elecraft mailing list

Re: Pro Audio PS

I also have one of these power supplies and am very happy with it. Can someone please explain how it knows what voltage is input (120 v versus 240 v) to get the same 12 volts output. Is there a different power cord? Am sure it needs the correct wall plug adapter. Or is there just a 12 volt regulator in the output? Inquiring minds (my old 74 year old one at least) want to know.

David J. Wilcox K8WPE’s iPad

> On Jul 29, 2019, at 7:42 PM, JP Douglas <[hidden email]> wrote:
>
> Hi all,
>
> I have one as well for my KX3, I've even taken it with me on holidays to the Caribbean were voltage is 240 volts, still plug and play, works on 120 or 240 volts. Excellent product though in the shack I run the KX3 on battery/solar power.
>
> 73 de Jose Douglas KB1TCD
>
>
> Sent from my iPad
> ______________________________________________________________
> Elecraft mailing list
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Michael Walker

Re: Pro Audio PS

Dave

Just about every 'wallcube' switching power supply is auto input voltage
sensing. This includes Laptops, iPads, and phone chargers. Even the
Astron switching supplies can handle 110 or 220 although some will have an
internal switch to make that happen. This is a great feature, but the cost
is switching power supplies can be RF noise if not choked correctly.

You just need a simple and inexpensive plug adapter depending on the
country you go to.

Look at the power supplies you know own and it will show their input range.

Mike va3mw

On Tue, Jul 30, 2019 at 5:42 AM David Wilcox via Elecraft <
[hidden email]> wrote:

> I also have one of these power supplies and am very happy with it. Can
> someone please explain how it knows what voltage is input (120 v versus 240
> v) to get the same 12 volts output. Is there a different power cord? Am
> sure it needs the correct wall plug adapter. Or is there just a 12 volt
> regulator in the output? Inquiring minds (my old 74 year old one at least)
> want to know.
>
> David J. Wilcox K8WPE’s iPad
>
> > On Jul 29, 2019, at 7:42 PM, JP Douglas <[hidden email]> wrote:
> >
> > Hi all,
> >
> > I have one as well for my KX3, I've even taken it with me on holidays to
> the Caribbean were voltage is 240 volts, still plug and play, works on 120
> or 240 volts. Excellent product though in the shack I run the KX3 on
> battery/solar power.
> >
> > 73 de Jose Douglas KB1TCD
> >
> >
> > Sent from my iPad
> > ______________________________________________________________
> > 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
> > Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
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Don Wilhelm

Re: Pro Audio PS

In reply to this post by Elecraft mailing list

David,

Insensitivity to input voltage is characteristic of a switching power
supply. The switcher input takes power from the AC line, rectifies it
and stores the energy in an inductor. Then the switching circuit takes
the inductor energy and dumps charge in a capacitor in its output to the
desired output voltage. Unlike a linear supply, no transformer or
linear regulators are required.

This is greatly oversimplifying the circuits and operation of a
switching supply, much additional design must go into it to control the
switching circuit, component rise and fall times and output filtering.

73,
Don W3FPR

On 7/30/2019 5:41 AM, David Wilcox via Elecraft wrote:
> I also have one of these power supplies and am very happy with it. Can someone please explain how it knows what voltage is input (120 v versus 240 v) to get the same 12 volts output. Is there a different power cord? Am sure it needs the correct wall plug adapter. Or is there just a 12 volt regulator in the output? Inquiring minds (my old 74 year old one at least) want to know.
>
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Elecraft mailing list

Re: Pro Audio PS

Thank you all for the information. Will Wiki it too so I can look at a schematic or two of how it happens.

Dave K8WPE

David J. Wilcox K8WPE’s iPad

> On Jul 30, 2019, at 8:55 AM, Don Wilhelm <[hidden email]> wrote:
>
> David,
>
> Insensitivity to input voltage is characteristic of a switching power supply. The switcher input takes power from the AC line, rectifies it and stores the energy in an inductor. Then the switching circuit takes the inductor energy and dumps charge in a capacitor in its output to the desired output voltage. Unlike a linear supply, no transformer or linear regulators are required.
>
> This is greatly oversimplifying the circuits and operation of a switching supply, much additional design must go into it to control the switching circuit, component rise and fall times and output filtering.
>
> 73,
> Don W3FPR
>
>> On 7/30/2019 5:41 AM, David Wilcox via Elecraft wrote:
>> I also have one of these power supplies and am very happy with it. Can someone please explain how it knows what voltage is input (120 v versus 240 v) to get the same 12 volts output. Is there a different power cord? Am sure it needs the correct wall plug adapter. Or is there just a 12 volt regulator in the output? Inquiring minds (my old 74 year old one at least) want to know.

Josh Fiden

Re: Pro Audio PS

The adapter PAE sources is a flyback converter.

https://en.m.wikipedia.org/wiki/Flyback_converter

Flyback is a buck-boost DC/DC converter where the inductor is split into a transformer to allow a big voltage change (340v in to 12v out) and provide galvanic isolation for safety.

There’s a controller which adjusts the pulse width and period of the MOSFET switch that charges the primary to regulate the output voltage under changing input voltage and load current.

73
Josh W6XU

Sent from my mobile device

> On Jul 31, 2019, at 2:14 AM, David Wilcox via Elecraft <[hidden email]> wrote:
>
> Thank you all for the information. Will Wiki it too so I can look at a schematic or two of how it happens.
>
> Dave K8WPE
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