Hi Jeff, Sorry for the long delay - my car died and I'm having trouble finding a new ignition module, so I had to redesign the one that failed.
> Date: Thu, 1 May 2003 14:55:36 -0500 > From: "Jeff" <[email protected]> > To: <[email protected]> > Subject: RE: CS>MultiMeter Question > Thanks Mike, > I am using alligator clips to connect everything. But I am not > using batteries anymore either. I finally got a generator (from > circuits Maximus) and was attempting to put the MM inline to > monitor the ma cause I read where Ole Bob said to run it till it > hit 3ma I think. Is this the one you mean? http://www.bioelectrifier.com/csg.htm I'm impressed with your choice! Yes, you will find a power supply is much better than batteries. A good source to supply 24VAC is an ordinary doorbell transformer, available from Home Depot and other hardware stores. This will give you about sqrt(24) = 33.6VDC to work with. But you have to deduct the voltage drop in the bridge rectifier, so the output will be around 32V. The schematic shows two 470uF caps after the bridge rectifier. You only need about 10uF per mA, so a single 22uF 50V cap would be fine. It can be larger, but the values shown in the schematic are a bit of overkill. The 7805 is not the best choice for current regulation. It is designed to supply a regulated output voltage of 5V, and requires an additional 2V to operate. This would reduce the supply voltage to 32 - 7 = 25V before it gets to the anode and cathode. This would work, but it would take a while to get into current limiting. A more important problem is the circuit is designed to limit at 20mA, which is way too much current for your needs. As Bob mentioned, you need a much smaller current. Using the LM117 as a constant current regulator is often discussed here. Unfortunately, this chip has a minimum specified output current of 3.5 to 5mA, which again is higher than you may want. Some LM117's may work at lower current, but the performance is not guaranteed, and it may vary with changing load current. The result is the concentration of silver may change unpredictably. For more information on how to calculate the current you actually need, and a way to overcome the above problems, see my web page at http://www3.sympatico.ca/add.automation/misc/130vdc.htm (As long as you are starting with 24VAC, you might as well do a proper job:) > I was thinking about that resistor, I have no knowledge of > electronics at all mind you, but I was thinking to cut the wire > with the alligator clips in half then solder the resistor in to it > and cover it with one of those shrink tube things. Would that > work, and does it matter which direction the resistor is pointed > in when I attach it? That would work great! The shrink tubing would help support the resistor leads, which are quite fragile. No, it doesn't matter which way the resistor is pointed. (It does matter with diodes and electrolytic capacitors.) > I want to get a set system on how I am going to make the CS every > time, monitor it with the MM, and send a sample to Ole Bob to have > it checked. I am wanting a between 10 and 20 ppm final product. > And I appreciate all the help I have been getting on this from > this list. Cause like I said, I have no knowledge of electronics. > Some things just don't click in my brain for some reason. Sure, it's confusing when you first approach it. But from your questions, you certainly have the intelligence to pick it up very quickly. I think you will do fine. Best Regards, Mike Monett -- The silver-list is a moderated forum for discussion of colloidal silver. Instructions for unsubscribing may be found at: http://silverlist.org To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
