[WriteLog] SO2R headphone switching

[Pat Cain, K0PC]

Barry,
The LPT port has an output for A/B switching on pin 14. I use it to drive a 
transistor that controls a DPDT relay. Very similar to the LPT port CW 
keying circuit.

Pat

At 03:26 PM 11/29/00 -0500, you wrote:

>Currently I have a manual switch to switch headphones between
>radio 1, radio 2, and one ear for each.
>Seems to me a relay setup to switch both ears to the non-CQing
>radio, while the run radio is xmitting would be more efficient. Has
>anyone done this? I'm not lokking for something to switch mics,
>keyers, etc., just the receive audio.
>Tnx/Barry
>--
>Barry Kutner, W2UP              Internet: w2up@mindspring.com
>Newtown, PA         FRC         alternate: barry@w2up.wells.com
>
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