Some wall warts are regulated, most are not. The CMOS loads of the keyer would let that 18 volt one ride at 18 volts and very likely fry to keyer. 73, Jerry, K0CQ -- FAQ on WWW: http://www.contesting.com/tentecfaq.htm Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com Search: http://www.contesting.com/km9p/search.htm