On Sat, 06 Feb 2010 12:29:04 +1300, "ivp" said: > > You may have already thought of using a rotary potentiometer with > > a ~100mm diameter pulley on it, and use a string attached to the slide, > > in the style of a dial cord in old radios. > > If it's robust enough in the long term (got a bit of a downer on carbon > pot > tracks but you can get conductive plastic, at a price) that might be a > goer Allen-Bradley makes long life pots that really are long life. Back to the PC board slide switch idea, if everything is polished and you grease the contact surfaces, it could last a long time. You could even put rivets, screws, or other type of contact buttons on it. Or crimp sheet metal around the edge of the board. Cheerful regards, Bob -- http://www.fastmail.fm - Email service worth paying for. Try it for free -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist