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Colloidal Gold Production / Just purchased some 1% Gold Chloride..
« Last post by Pemf silver on Today at 07:01:27 PM »
It’s been a while since I made colloidal gold , I remember the energy i felt when consuming it , but what I enjoyed most was the lucid dreaming 👍🏼
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Colloidal Silver Production / Re: 320ppm precipitation
« Last post by FromTheDen on Yesterday at 01:22:35 PM »
Both good thoughts, thanks!
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Colloidal Silver Production / Re: The Power Supply Unit
« Last post by aquataur on Yesterday at 07:32:35 AM »
Those units tend to create the impression that you throw them at any voltage and they do their thing. Wrong.
As mentioned earlier, any CC circuit has to digest the power it dumps. You easily cook them.

And there is nothing "constant". The datasheet even tells you the current spread.
This "constant" refers to driving LEDs and such, where the term is relatively correct.

Nothing comes without penalty.
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Colloidal Silver Production / Re: The Power Supply Unit
« Last post by Gene on March 26, 2024, 08:33:29 PM »
The problem with regulator diodes is that they drift as they warm up. They're NOT diodes. They're a JFET with a resistor connected appropriately. There is no high accuracy, temperature stable reference element in them.

If you want that with using a 2 transistor limiter, replace the feedback transistor with a TL431 shunt voltage regulator. Its a 3 pin, TO92 package.  It will require setting the sense resistor to a value where you develop 2.5V across it at the desired current.

The TL431 acts sort of like a voltage comparator comparing the sense input to an internal 2.5V bandgap reference (rock solid stable, temperature compensated).

Resistor between power and the "cathode" side of the thing. The cathode goes to the base of the main transistor. The anode side goes to ground.  The emitter side of the sense resistor goes to the 3rd terminal (shown as a terminal that comes off the body of the diode in the symbol that represents it).

In this configuration it acts like a voltage comparator. IF the voltage on the sense resistor exceeds 2.5V, current flows from the TL431 anode to ground dropping the voltage being presented to the base of the pass transistor, thereby reducing current to compensate. Conversely, too low a voltage causes less current to flow through it which raises the voltage on the base of the pass transistor and increases current flow.

Yeah, for all of a couple pennies a piece from Aliexpress.

If you download a datasheet for the TL431A (Ti.com, others), there should be an application circuit for a precision constant current sink later in the datasheet. Thats what you want.

Just be warned that the pinout of this thing is NOT the same as the transistor you'd be replacing it with!!!  Believe the TL431A datasheet (wink).
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Colloidal Silver Production / Re: The Power Supply Unit
« Last post by RickRac1 on March 26, 2024, 07:54:52 PM »
A simple solution is a "current regulator". You can get 10 or 15 mA ones for a dollar from Mouser.com plus shipping. Its a simple solution.  Search for S-103T. I used the low current ones to makes DC brain learning devices. At 1-2 mA, they were great. They are directional so do check them with a meter.

Do not trust a cheap power supply to put out 0.015 Amps accurately. I have several of them. Also its serious overkill when a $2 12volt power supply from a thrift store and a current limiter will do the same.
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Colloidal Silver Production / Re: Gelatin substitute -- sodium caseinate
« Last post by kephra on March 25, 2024, 05:59:42 PM »
I made an attempt to make high ppm colloidal gold using casein.  It failed as I did not have enough sodium carbonate in the solution to balance the acidity of the gold chloride.  This resulted in a lot of 'mozzerella cheese' with the gold. After filtering out the cheese, the product looked very good though.

On my second attempt, I used 1 ml of sodium carbonate solution for each ml of gold chloride. 
For the run, I started with 200ml of water, 3ml of Karo, 1/2 tsp of casein, 15ml of  sodium carbonate and 15ml of gold chloride. No cheese, but the gold did not reduce, as now the pH was too high.  So I added more gold chloride, until suddenly the gold all reduced. 
This took 5 more ml of gold chloride.  The result was no cheese, but great looking colloidal gold at about 800ppm.
When I attempt this again, I will try to determine the optimum ratio of sodium carbonate to gold chloride.

Theoretically, the molar ratio of gold chloride to sodium carbonate should be 2 to 1.
2HAuCl4 +Na2CO3 --> H2O + 2NaCl + CO2 + 2AuCl3  A little more will be needed to activate the reducing agent.
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Colloidal Silver Production / Re: The Power Supply Unit
« Last post by kephra on March 25, 2024, 04:17:13 PM »
...
A slightly more complex version of a current limiter is the Constant-Current-Two-Pole. It is made out of ubiquitous components.
https://www.elektronik-kompendium.de/public/schaerer/curr2pol.htm
This is the method I used for the Silvertron Junior and the Silvertron Mini generators I used to sell.
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Colloidal Silver Production / Re: The Power Supply Unit
« Last post by aquataur on March 25, 2024, 04:00:07 PM »
I see this subject comes up frequently.
I deviated from the LM317 because of the issues mentioned here already.

* both the TO-220 and the TO-92 version have a limit as to the minimum current they can be throttled down to.
* both cannot take more than 40V (not needed here)

A slightly more complex version of a current limiter is the Constant-Current-Two-Pole. It is made out of ubiquitous components.
https://www.elektronik-kompendium.de/public/schaerer/curr2pol.htm
You would probably need to employ a translator program.

It can be used as a current source or sink - hence the term "two-pole".
You can set any small current you like with unbeaten stability and use it with voltages up to several hundred volts if you like.
Use BD139/140 or similar for up to 80 Volts.
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Regarding gelatin premix, add it first and then top off for the correct amount of water.

That's the short version of my epos. It could not be any more condensed.

Regarding the formulas for gelatin:  They are all completely wrong.

Hahaha, the whole nightmare powderized ;D

Great that I had fun writing it at least. I guess in dense nebula any indicator for the right direction is welcome.
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Regarding gelatin premix, add it first and then top off for the correct amount of water.

Regarding the formulas for gelatin:  They are all completely wrong.  You cannot accurately base it on ppm or weight of silver because not all of the silver atoms need the gelatin.  Only the atoms on the surface of the nanoparticles need and indeed can even have gelatin attached.  Its like painting your house where you buy your paint according to the area you want to paint, and not the volume of the room.  Also unknown is how many layers of gelatin bond to the nanoparticle.  Is it 1 or 2, or 1/2 etc. Who knows? So whatever number you get with one of these formulas is at best a guesstimate.  Also. gelatin is not a standardized product, and varies as to molecular weight and size depending on who made it and what it was made from.  Therefore I have always discouraged weighing it, as its a waste of time.  Its the difference between a bullet and a hand grenade.  A bullet needs to be aimed perfectly, while a hand grenade only has to be close enough (20 meters). Faraday's law is a bullet precisely aimed at a target while gelatin is a hand grenade. 




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