Production Techniques and Chemistry > Colloidal Silver Production
HOW TO MAKE COLLOIDAL SILVER if you can't get a SilverTron
cfnisbet:
For some time now, we have seen people struggling to put together the appropriate kit to make colloidal silver.
I thought it was time to go through the non-SilverTron process for those who wish to have a kit with which to make their own colloidal silver but who don't know what to buy or where to buy it from.
I will be going through the entire process, with links to where the items can be purchased. We have no arrangements or sponsorship with any suppliers, we are completely independent.
P.S. If they become available again, a SilverTron is a much better option, but it costs a lot more.
cfnisbet:
The Power Supply Unit;
This is the sort of laboratory bench Power Supply Unit you need. The one in the photo is a 30 Volt 5 Amp DC power supply. It must have a Constant-Current circuit in the specifications, and 30V with 3A output is about the minimum.
I am not going to give schematics or tell people how to convert a plug-in wall transformer, as I want anyone to be able to buy the stuff that I recommend straight off the shelf and use it.
The disadvantage of this unit is that the Constant Current circuitry is not very accurate in the measurement of very small currents, but it does hold that small current accurately. What I mean is that one of my bench PSU holds a current of 5 milliamps accurately at 7 milliamps; the stated current (5mA) is not the same as the output current (which is 7mA), but it does hold 7mA reasonably closely throughout the run. It is therefore adequate for our purpose.
The units are reasonably cheap and can be bought from eBay or Amazon very easily.
cfnisbet:
This is the sort of thing;
https://www.amazon.co.uk/gp/product/B07FY4J9PY/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
or
https://www.amazon.co.uk/ReaseJoy-Laboratory-Regulated-Adjustable-Precision/dp/B06X9DD4HJ/ref=sr_1_31?dchild=1&keywords=DC+constant+current+power+supply&qid=1585642963&s=diy&sr=1-31
or
https://cpc.farnell.com/tenma/72-10480/power-supply-1ch-30v-3a-adjustable/dp/IN06822
as discovered by member Turbidaceous.
If you enter the search term as "DC power supply regulated constant current" then loads of similar offerings will come up. It is acceptable for the PSU display to have 3 digits (this will allow you to use a minimum current of 10mA), but it is better to check that the display is 4 digits with a minimum current of 0.001 A (1mA) in the specifications.
Don't use one with reversing polarity, because we are going to use a copper/brass rod for the cathode, and reversing polarity will put unwanted contaminants into the water.
When the colloidal silver is being brewed, you should see the constant-current circuit hold the amperage within a certain range. At the currents we are using, the machinery cannot hold the current rock-steady; you will have to settle for a reasonable approximation of steady-stage current; that was what the SilverTron did so very well, amongst other things.
cfnisbet:
Then you will need a hotplate and beaker like the ones shown. If you are just beginning, I would suggest that you buy a 1 litre cafetiere (or more than one) from your local supermarket. These are very cheap and are available in sizes from 250 ml up to 1 litre. When you gain experience or if you want to make larger amounts at once, then the 3-litre Pyrex beaker shown is a good choice. Remember that the beaker, although it may be Pyrex glass, will still crack if you heat it empty and then pour cold water into it. Fill it with distilled water before you switch it on, and don't leave it unattended at any time.
The hotplate is a cheap single hotplate of the sort suggested for student accommodation (!) at about 20 GBP or thereabouts.
cfnisbet:
The next item is a digital ammeter as shown. eBay or Amazon will give you plenty of choice, but you will need an Ammeter with a scale for 0-20 mA and 0-200 mA DC and 0-20 volts DC. This is because the built-in meters in the PSU do not give adequate accuracy at very low amperages of the sort we are going to use.
It will also enable you to accurately measure the voltage if you need to.
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