On Sat, 2010-12-11 at 17:53 +1100, Erik Christiansen wrote: ... snip > Adding a pull-down resitor to OK1's emitter, followed by the 3 spare > CMOS gates, wired in parallel, will provide the required push-pull drive > to C1. (And remove the problem of wasted gates.)
Thanks Erik. I to study what posted, but it seems to put me back on the right track. ... snip > > the input shorted to a supply. The .1uF C2 cap would show a ~2V spike > > when I made the +5V DC connection, I get nothing with the .33uF C2. > > I'm not sure that I follow the details of this, but the basic charge > pump already checks for DC input (i.e. loss of oscillation), including > short to either rail. If C1 is not actively driven high and low, then > there is no output. The circuit works properly to detect non-AC input. It's just when the +5 input is connected, there is a one pump charge that gets through which is large enough to bring the output cap up a couple of volts in a spike. I am concerned that when the machine power is turned on and there might be a glitch on the output. A slightly larger output cap absorbs the glitch, but cap also charges up well enough with real AC input (or more than one pump in a row). -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Oracle to DB2 Conversion Guide: Learn learn about native support for PL/SQL, new data types, scalar functions, improved concurrency, built-in packages, OCI, SQL*Plus, data movement tools, best practices and more. http://p.sf.net/sfu/oracle-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
