>In the mid 80s a CMOS Cookbook had a venerable circuit (4001 NAND?) >that is very Effective agianst this. It had 5 to 6 resistor two NAND gates >and one capacitor It is commonly used in Medical equipment. The book might >have been >published by SAMs... I've got the book, and in fact the circuit I'm using is in there, in the "Clocked Logic" chapter. I'll browse around some more and see if I can find the one you're talking about... Dave