Well on a pulsed design there is no decent way to control current other than a resister to limit current. I did try to make a current controlled dc pulsed circuit, but again I found it failed miserably as current control circuitry works best with a relative steady known input, whereas a pulsing circuit made that very difficult either implementing that on the input or output, even when I tried to calm it by smoothing it with a appropriate capacitor.
The 555 will output around 1v below input voltage use ohms law to figure out what resister you need to achieve .28ma max. I have tried even played around with seeing Which frequency works best on the brew and found that in the end it was a humble current controlled circuit that produced the best results for me. I use a silver electrode which gives me around 6square inches of area facing the cathode. I use a lm 317 to control current to 1.5ma and i used to agitate the water with a motor suspended above the water which drove a plastic disposable cutlery knife through the water, which I found not usually necessary. ( the common wisdom it to agitate- but not severely) I can brew 2.5 litres ( sorry I am British-I am unfamiliar with imperial units) to 15ppm or 30us in 24 hours if I use 3ma of current instead, for 1.5ma it would take two days. Let us know what you choose to do and how you get on. With peace, Asif. On 29 Sep 2011, at 01:46, "ragrem...@netzero.net" <ragrem...@netzero.net> wrote: > Ok. So, if I stick with a quart-sized batch, what would I have to change on > the pulsed version at low current? > > Ray > > > > ---------- Original Message ---------- > From: Asif Nathekar <asifnathe...@hotmail.com> > To: "silver-list@eskimo.com" <silver-list@eskimo.com> > Subject: Re: CS>The importance of low current > Date: Thu, 29 Sep 2011 02:35:44 +0100 > > Also if you're going to brew a half gallon with a silver wire at .28ma. > You will require a lot of patience!. > More than you may have thought you may have. > With peace > Regards Asif. > > > On 29 Sep 2011, at 00:57, "ragrem...@netzero.net" <ragrem...@netzero.net> > wrote: > > This my first post and I am gonna be building my generator very soon. I must > decide now, what I should buy. > > There's an article online by a guy "lightman" who adds a current limiting > device to his generator. > > A reader added that he keeps the "CURRENT" around .28 milliamps max, using a > 30VDC power supply. I will be using a 12VDC power supply. Having to wait > longer because of a low current is OK with me, if in fact having the smaller > particles is a good thing. > > This guy also uses an aquarium air pump, claiming it helps keep the silver > particles smaller. > > I know absolutely nothing about electronics but the idea of using a "high > frequency pulsed DC supply" just seems logical to me. I am going to try and > build the "Bruce K. Stenulson" version he builds with the "Experimenters > Socket". > > http://www.stenulson.net/althealth/cspulse.htm#E Socket > > Some folks use a TDC meter and yet others a PWT? > > 1. Is running at such low CURRENT really beneficial? What changes would I > have to make to the "Stenelson" pulsed rig to achieve this low current? > > 2. Does the air pump improve the CS? > > 3. Which gives a more accurate reading, a TDC meter or a PWT? Is it safe to > assume that if I check the resistance of the CS in the jar with my > multi-meter and, stop the process at the same reading each time, that my PPM > should be very similar with each batch? > > 4. If I wanted to make a half-gallon at a time, would I need to change > anything? > > Thank you guys for tolerating such a long post!
