MOSFET Iambic Touch Paddle

Touch paddle circuits intrigue me, and I breadboarded one I thought would work using a 2N7000 MOSFET and a 2N2222 keying switch. It relies on skin resistance but only a very minute current level is needed to turn it on.

This circuit works quite well. I liked the action and used it for some time while it was still breadboarded (izzat a word?). I employed only 2 bare wires for the touch plates, and the action was very solid. Small PC Board pads could be used for touch plates, and should increase reliablility if needed for those with dry skin..

I used this paddle as a finger tapper while breadboarded. It worked perfectly, seemed immune to RF, and was very reliable as a finger tapper design. I intend to build a Manhattan style finished version to use as a backup paddle for portable ops. Possibly using a 3 volt CR2032 lithium battery for power.

If you experiment with this simple circuit, please let me know how it plays for you.

Revised 2 Dec 2012
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