>From: Jason Ringas <[email protected]> >Has anyone tried high voltage DC, instead of AC to make CS?
Depends on what you mean by 'high voltage DC'. There are commercially available high voltage DC CS generators, that use around 180 VDC. You might try visiting your local surplus electronic stores. They might have an adjustable DC voltage power suppply. (One of my local stores used to have a bunch, that went up to 1000 VDC. By the time I realized that I could use one of these to make CS, he had sold out of them.) You can make a 180 VDC generator yourself, fairly easily. 120 VAC, through a bridge rectifier, with an appropriately sized capacitor to smooth out the pulsing, and something to limit the current/guard against short circuits blowing a fuse. Be careful that you don't electrocute yourself. If you build your own generator, it might be a good idea to get some sort of PPM tester. They are accurate enough for our purposes (IMNSHO), and if you pay someone else to test your CS, you've almost paid for a tester. What most people seem to have are TDS-1's. I have one. I recently posted about it to this mailing-list. (Are the articles to this mailing list archived anywhere yet?) >From my article: >My TDS-1 arrived yesterday. Here are its specs: > Range 1-999 ppm > Resolution 1 ppm > Accuracy +/- 10 ppm > Typical EMC deviation +/- 1% full scale > >If you want to buy a TDS-1, go to their web-site http://www.hannainst.com >and there are details there somewhere on how to buy one. See if there >is someone near you with a calibrated TDS-1 that you can calibrate yours >against; otherwise you should also buy the calibration solution (25 packets >of the stuff, for around the same cost as a TDS-1). > >If anyone is in my area and wants to buy a packet or two of the calibration >solution, get in touch. I have 24 left :-) > >I'm concerned about the accuracy specification of the TDS-1. >It's almost tempting to buy a PWT (Hanna Canada special, 2 for $83 CDN, >plus whatever it costs for the calibrating solution). It's specs are: > Range 0.1-99.9 microS/cm > Resolution 0.1 microS/cm > Accuracy +/- 2% full scale >I'm told that 1.0 microS/cm is equivalent to 0.5 ppm. Anyone in my area interested in going splitzies on getting two PWT's? fred -- 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]>
