[Elecraft] how much current can the 5V Mic bias handle?

[Stewart Baker]

Hi Werner,
I would not recommend this approach.

The +5v from the Mic connector is for delivering a low current.
It is susceptible to interference both in and out of the K2.

In addition any spiking on the +5V will effect the control board 
MCU due to poor design of it's reset circuitry. 

If you are happy making mods, then you can try this.

I put in a separate +5V supply to the Mic connector by using a 5V 
regulator mounted on the front panel board and fed from the 8A 
line on the RF board. There is a spare connector pin/socket (Pin 7 
on J1) that is labeled AUXBUS(NC) which can be used to get the +8V 
thru. Of course the existing feed must be disconnected.

73
Stewart G3RXQ

On Tue, 08 Jan 2008 09:53:15 +0100, Dr. Werner Furlan wrote:
> hi,
>
> I would like to operate a cable GPS mouse the the K2 and it 
would be
> convenient if I could steal the 5V from the Mic connector.
> Will this be a problem - the current consumption is probably 
below 100mA.
>
> 73! de Werner
> OE9FWV
>
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