[Elecraft] Pro Audio PS

[David Wilcox]

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 <donwilh at embarqmail.com> 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.