[Elecraft] K3 on Order

[Brett Howard]

The main reason why most devices take DC in rather than bringing in
direct AC is because they can pass all the safety work on to the brick
manufacturer and it saves them a lot of money in the regulatory end.

~Brett (N7MG)

On Fri, Jul 16, 2010 at 9:08 AM, Paul Christensen <w9ac at arrl.net> wrote:
>> Sharing a single power supply between the transmitter and
>> accessories is a very good way to create "RFI" (even with
>> a dummy load) due to the "pin 1" problem in nearly every
>> amateur rig ever built.
>
> I completely agree with Joe, but I'm guilty of using a common supply for the
> K3 and switching-type accessories.
>
> However, if a common supply is used with a distribution block, consider
> connecting the K3 direct to the power supply terminals and not a port on the
> distribution block.  Then, if a power distribution block is used, route
> accessories from the power supply terminals to the block, especially if one
> is insistent on running audio accessories from the +12V bus.
>
> The W2IHY products can be powered by +12V and seem to be very popular.  When
> using  a W2IHY device, it would be better to use the supplied wall-wart than
> be tempted to use a common +12V power bus.  If I was designing a similar
> device, I would rather design it for use with an AC wall transformer (AC
> in/out), then rectify and filter inside the audio device.  The added benefit
> is that bi-polar supply rails can be easily created with an AC input.
>
> Paul, W9AC.
>
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