Steve, since you sent this to silver-list-request, I assume it was your intention to send it along to the entire list.
I converted the attached JPEG to a black and white .gif, which is small enough to sneak under the message size limit. Thanks! Mike D. ------- Forwarded message follows ------- Date sent: Sat, 7 Oct 2006 12:14:57 -0700 From: "S&JY" <youngst...@konnections.net> To: <silver-list-requ...@eskimo.com> Subject: 0.2 ma constant current supply Folks, Attached, per your requests, is a schematic with a few notes for the Subject power supply. The LED and its series resistor is just so you can see that it is on and to remind you to unplug it after 24 hours. The 330 ohm resistor sets the constant current magnitude. If you need a different current, experiment with different resistor values until you get the current you need. Some of you may be outside the U.S. If so, the Wall Adapter may need to be 220 volt 50 Hz, or whatever is available. The only requirement is that it can put out a DC voltage of about 25 volts with the load being only a few milliamps. A unit rated at 18 volts under rated load typically puts out around 25 volts with a very light load, such as this CS generator. 3 nine volt batteries in series will also work, but you will need to disconnect them after each batch or the LED will quickly deplete the batteries. If you eliminate the LED, then the batteries can stay connected and will last almost their shelf life. For even electrode wear, it's a good idea to wipe them off and swap them each time you make a batch. To hold the electrodes, pin jacks are the best, but usually you have to buy them in quantities of 100. You can also use binding posts or epoxy on small alligator clips on the bottom of your box so you can easily swap the electrodes. These are available from Jameco or Radio Shack. Enjoy, --Steve Young ------- End of forwarded message -------
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