On Mon, 2008-04-28 at 19:54 -0400, John Kasunich wrote: ... snip > Using a schmidt trigger to clean up the output is good. However, there > is one potential problem. The two stage charge pump can produce more > than 5V, which the '14 might not like. Maybe a clamp diode to the > supply rail? Or maybe use just one stage - remove C2, short D3. You'd > have to make sure that one stage generates enough voltage to reliably > trigger the '14. ... snip > John Kasunich
You are right. I got 5.5 Volts on the pump output going into the first buffer. I figured it might be okay. I like the clamp diode idea. I see the datasheet indicates that I am at the max. TI's LS14 shows a zener on the input already, so I guess I don't really know how hard I am driving the input. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC/EMC CNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/EMC CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
