[TVARC] QST - Force Sensing Paddle > Schematic Error

[doncrosby at aol.com]

Paddle Enthusiasts 

I did a quick read on the Feb QST pg 42, Force Sensing Paddle, Nice idea, but no auto battery shut off, so I started sketching circuits to do that automatically....
Then I noticed that the sense of the dit and dah outputs was incorrect. So I went to the authors QRZ page and he had a note there about the pinning error.
So, if you are considering building the paddle keep in mind that you will need change pinning. My 2nd concern is that if you do a pin swap, the hysteresis (you want) will become negative feedback instead.
So this circuit needs a good review before a build. I know the author is on the case, but I just wanted to give you all a heads-up.
Meanwhile I am going to dream-up an auto-shut-off circuit to save the battery and send it to the author.
Good luck,Don, W1EJM



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