[Elecraft] K3S line-in and internal sound card at the same time

[Joe Subich, W4TV]

On 2020-11-23 4:08 PM, Jim Kutsch KY2D wrote:
> Is it possible to have the K3S internal sound card feed the
> transmitter audio and also have the line-in jack feeding it at the
> same time?
*NO* The "Line In" jack contains a switch that causes audio from the
from the "CODEC" (sound card) to the transmitter input to be 
disconnected and external audio (from the "Line In" jack) to be
substituted when a plug is present in the "Line In" jack.

Audio from both the CODEC and the Line In jack goes to a 74HC4053 switch
on the KIO3B - only one "input" of that switch can be selected at a
time.  The control signal is a simple "ground" created when a plug is
inserted into the Line In jack and applied directly to the 74HCT4053
without processing/control by the K3S controller.

73,

    ... Joe, W4TV


On 2020-11-23 4:08 PM, Jim Kutsch KY2D wrote:
> Is it possible to have the K3S internal sound card feed the transmitter
> audio and also have the line-in jack feeding it at the same time? I use both
> the internal sound card and an external sound modem for different data modes
> but have to unplug the line-in plug when using the K3S internal sound card.
> When something is plugged in to line-in, the internal sound card is
> disabled. On the other hand, K3S line-out and the internal USB sound card
> coexist very nicely and feed received signals down both paths.
> 
>   
> 
> If anyone is using USB audio in while something is plugged in the line-in
> jack, please share how. Thanks.
> 
>   
> 
> 73 Jim KY2D
>