[Elecraft] K3 12VDC OUT increased current mod available soon

[Wayne Burdick]

The only easy thing to change in this regard is the 1N4007. It  
probably drops close to a volt, and could be replaced with a 1N5817,  
etc. But if you want to pull more current, you also have to change the  
choke and the self-resetting fuse. We're working on that.

Wayne

On Mar 15, 2012, at 11:53 AM, Joe Subich, W4TV wrote:

>
> Instead of simply raising the current limit, you should be addressing
> the voltage issues as well.  With 1.7V (SB530 and 1N4007) of diode
> drop plus I^2*R losses in two chokes and the switch, the "+12V" is
> already low (11.8V) with a 13.8V supply.  Run the K3 on battery or
> figure in a typical 0.8V-1.2V sag in the input supply in transmit and
> the "+12V" output is less than 10.5V.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 3/15/2012 12:18 PM, Paul Saffren N6HZ wrote:
>> Many of you have asked if there is a way to modify your K3 so that  
>> it can
>> provide enough current to supply a P3 with the SVGA board.  We are  
>> currently
>> working on a mod kit that will do just that.  We'll let you know as  
>> soon as
>> we have something available.
>>
>>
>> 73,
>>
>> Paul (n6hz)
>>
>>
>> --
>> View this message in context: http://elecraft.365791.n2.nabble.com/K3-12VDC-OUT-increased-current-mod-available-soon-tp7376146p7376146.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
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