Pin 1 is the GROUND. Pin 3 is the voltage supply for the pot & goes to one side of the pot. 73, WD5FHG Joe -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm