[Elecraft] K3 - strange problem

[Mark Bayern]

> Anyone on the list experience this problem before?

Yep. Not me, but here is the description of the "KPA3 12V sense mod"
on the Elecraft website:

"This modification adds a diode to the KPA3 12V sense circuit to hold
the voltage to no more than 0.6V when the K3 is turned off. Without
it, some K3s refuse to turn off when the POWER button is tapped
because the 12V sense circuit does not drop to a low enough level to
shut down the K3’s MCU."

Checkout the web page at: <http://www.elecraft.com/K3/k3_app_notes.htm>

Mark  AD5SS








On Fri, May 15, 2009 at 7:31 PM, Robert Mccormack <zl1aih at xtra.co.nz> wrote:
>
> Hi all,
>
> When K3 #321 is switched off, it automatically switches on again.
> No error message, and all other functions seem normal.
> Of course it stays off when the power supply is removed.
>
> Alongside it, K3 #320 (both share the same 13.5v supply) operates as normal...
>
> Anyone on the list experience this problem before?
>
> 73, Ken ZL1AIH
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>