----- Original Message ----- From: Victoria Welch <[email protected]> >>snip<< > Seems like the 0.054W power factor might be considered the minimum to > start forcing the silver into the solution (ignoring, for the moment the > resistance of the solution). > > 5V x 0.000040 = 0.0002W (the starting current from the raw output from > the microcontroller) - a long way from 0.00729. > > Not sure just what this means, but I think it is a good indicator of > required minimum voltage?!
Silver ions will enter the water at any potential above 0.8 volts. Of course at this voltage (power factor) generation is painfully slow. A good compromise is to use relatively high voltage to overcome the high resistance of DW in the begining stages and then to lower the voltage as the process procedes. Limiting the current does this as you know. Deciding on the current limit value is a compromise between speed of reaction and quality of product. Low current values allow for a clear colloid at high concentrations. The Tyndal effect of well controlled colloids is little, if at all during generation, but does gain in intensity after the power is withdrawn, reaching maximum intensity about 24 hrs later. The concentration may also increase during this time. >>snip<< > Sigh, I get really tempted to just shelve experimentation with this > until I can afford to come up with some test gear that will give me PPM > metrics with some degree of accuracy, until I can do that, I just keep > feeling that these experiments are ultimately meaningless, taste and > Tyndal are just too relative to communicate accuracy. Indeed. But you can work out the starting and finishing resistance of the solution from the results I posted. About 240K dropping to about 20K at 10 ppm. This could be used as a ball park figure (extrapolated to your own set up) for judging ppm or at least a consistant finishing point. > > A question: > > How would one go about turning off the power to the electrodes at > > a specific resistance as measured by voltage and current draw. > > Further, would it be possible to input starting resistance > > (calibrate as zero or some other nominal value) and then switch > > off at some other particular resistance. > > Anyone? > > There are ways to do this, I've had a couple of thoughts (inexpensive) > on the matter but until I get the basics down I'm leaving that alone > :-). There are industrial sensors and methodogies that will do it, but > they are not cheap :-). > > One of the thoughts is to use the "pot" statement from the stamp, it is > normally used to read a variable resistor returning a value from 0 to > 255. I'm not sure how this would work, it would require some > experimentation. > > Much appreciate the response! > > Thanks & take care, Vikki. Thank you too. Ivan -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
