[Elecraft] Re: [Elecraft] K2 & switching power-supply donŽt w ork?

[Don Wilhelm]

Martin,

Just making a wild guess, I must ask --
Do you have reversed polarity from the power supply?  If that were the
problem, then K2 internal polarity protection diode would block the DC - you
would measure fuul power supply voltage on the power connector.

73,
Don W3FPR

----- Original Message -----

> Hello elecrafters,
>  I modified a small switching power-supply to provide the correct
>  voltage for charging the K2-Battery. This supply is small
>  enough to fit in my pocket, perfect for travelling/holidays.
>  See: http://www.t-online.de/~dk3red (in german language).
>
>   I tried to power the K2 with that supply for receiving,
>  but the K2 wonŽt come to live (internal battery-switch in
>  off-position). There is no drop in voltage measured at the plug.
>
>  Using the same plug connected to a different power supply (also
>  switching, though), K2 comes to live.
>
>  This may sound grazy, but thats the way it is.
>
>  What is the reason for this behavior?
>
>  Maybe there is something inside the K2 that senses the switching
>  power-supply, says "no good" and refuses to work? ;-)
>
>  Maybe a small amount of AC that makes the fuse drip?
>