On Sun, 2010-12-12 at 15:59 +1100, Erik Christiansen wrote: ... snip > That's controlled by the C1/C2 ratio. Consider the > charge Q tranferred from C1 to C2 on one pulse: > > C1*V1 = Q = C2*V2 > > If C2 = 10*C1, then V2 = V1/10 , minus diode drops.
I found that even without a resistor across the bucket cap the bucket would leak pretty rapidly. I don't know if the leak was into the scope probe or something else. The 1X/10X probe setting didn't seem to make a difference. I would think this unknown leak would make the calculations more difficult, unless one could model the leak. The .1 to .3 uF C1/C2 ratio seemed to pass all tests on the bench. ... snip > Hopefully that'll further help avoid the need to figure it all out the > hard way. (Just yell out if too many details are spoiling the > investigative fun. :-) > > Erik When I was much younger, I was pretty decent at math and pursued mechanical engineering because I was fascinated by the thought of being able the mathematically model a physical system and actually have the real system match. I dropped out, but I still like to try to play with math. Although, most times it's easier to guess and just get-r-done. I revised my circuit: http://www.wallacecompany.com/machine_shop/EMC2/Charge%20Pump/chpmp-5b.png I need to add a voltage regulator and filter caps, but there is no magic there. I've noticed Matt's circuit is leaner because it doesn't need one. My circuit might be improved with some I/O protection, but that will make it more complex. I've ordered some 74HC14's in order to build my latest try, but I'm getting the itch to move on. -- 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
