Hello Ivan, Thanks for the response!
> [ ... ] > 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 is withdrawn, reaching maximum intensity about 24 hrs later.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. I keep checking the 5V batch I did last night, still tastes like CS but has NO Tyndal effect *yet*. I've set this batch aside and will keep checking on it. > >>snip<< > > Sigh, I get really tempted to just shelve experimentation with > [ ... ] > 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. One thing I am considering is going to a PWM (pulse width modulation) output from the processor going through a low pass filter into an op amp (gain around 2.5) so I could gradually ramp up the voltage (or down). Just starting to formulate this one :). This would feed voltage to the H-Bridge. I've used this kind of thing for other projects in the past and it works well. Thanks for this, I've been scratching head all day about how to best proceeed at this point. I have a few questions that I might even be able to formuate that might make sense. I've been using an electrode spacing of 2.75", it seems to work. I have read of spacings from 1/8" to 1" and so being used. Does this ultimately make a difference. I'm still confused about this aspect. The "wetted length" of my electrodes is about 4.5", I keep seeing things that look like they might be an inch or so and some units have three electrodes in them. I am considering cutting down the wetted length to around 2", would that mean that I need to close up the spacing? Is this a good idea when using the 12oz glass with a depth of 4.75 to 5 inches when filled with DW? One of the reasons for the above is that I would like to sample the resistance of the solution while the process goes on. Hookup wire and meter probes being stuck in the solution seems like a bad idea (goddess only knows what metal content they consist of). This would give me silver wires to use for resistance probes. Many questions! any ideas or suggestions appreciated! BTW: one thing I noticed about the electrodes on the last batch I did after going back to the 27V with polarity reversing is that the electrodes were MUCH cleaner. Instead of one electrode being black and the other the dusty grey both were a slightly darker dusty grey with much less of a build up on either. The other thought I am having is trying to determine what it would take to build a TDS meter, currently meditating on this. The parts wouldn't be that expensive (might even have most of them), but then you get into calibration :-). Something reasonably easy to build and reasonably accurate might go a long way to resolving a lot of my questions :-). Hope this made sense :-). Thanks & take care, Vikki. -- Victoria Welch, WV9K, DoD#-13, Net/Sys/WebAdmin SeaStar.org, vikki.oz.net "Walking on water and developing software to specification are easy as long as both are frozen" - Edward V. Berard. Do not unto others, that which you would not have others do unto you. -- 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]>
