On Thu, 2010-12-09 at 22:26 -0800, Kirk Wallace wrote: > On Thu, 2010-12-09 at 20:06 -0800, Kirk Wallace wrote: > Some corrections: > 74HC04=Hex Inverter, I tried a 2in NOR, but it's all the same. > > I blew out the only 74HC (74HC04 NAND) part in my junk box, so I cut my > ... snip > > I also wired this up: > > > > +--------- O'Scope > > _ _ | > > _| |_| | | C1 .01uF > > -----------\/\/-----+---||--+ > > R1 15k | > > V (gnd) ... snip
I used this to measure the caps I had on hand and found that I really need to invest in a cap kit. I have just a few different values which isn't enough for tuning as circuit up or down 10 or 20%. Here is what I have on the bread board now: http://www.wallacecompany.com/machine_shop/EMC2/chpmp-4a.png I changed C2 from .1uF to .33uF. The 1kHz pumped voltage is now a little higher, ~4 V with very little ripple, and the decay rate is about the same. So I want to go to the next level. Here is my latest stab at an all analog charge pump: http://www.wallacecompany.com/machine_shop/EMC2/chpmp-5a.png I'm thinking the opto-isolator on the input might be a good thing, but using an IC for one gate seemed kind of silly so I was thinking a FET on the output might work. I have no idea if the output circuit makes any sense. Comments are welcome. I'm still working on a tone detector and AVR version. -- 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
