Hi Bob, I know you're trying to produce the cheapest circuit possible to help keep people well, especially in areas of the world where medical help isn't available. But injuring someone because of a component failure is probably not in their best interest.
For places in Africa, probably the best type of circuit would be a "Baygen" Zapper or CS generator. :) Something that didn't need batteries or electric power lines to run. One of the low-cost (to us) crank/solar radio's (not the Baygen brand) could be adapted to produce the pulses or current needed. On Mon, 21 Aug 2000 11:18:02 -0500, Bob Squires <[email protected]> wrote: > I can think of many hundreds of electrical devices that use no >isolation transformer . Everyone's home is filled with them. But Bob, there's a very stringent set of codes that remove practically all possibility of a person coming in contact with a live circuit if there's a component failure. A CS generator has easily accessible electrodes. A Zapper (or Beck device) is *intended* to put electricity into your body -- all of the other devices in your home are designed to do the exact opposite. Home-use equipment -- vacuum cleaners, kitchen mixers, electric stoves, refrigerators, electronic equipment -- all are "double insulated" or have a grounding (3-wire) plug. What you can touch without dismantling the equipment is either completely non-conducting, or is connected to the power system ground. The computer you're using to get on the Internet has these items (assuming it's UL approved). The power connector is a 3-prong unit with a power system (house) ground prong. The power supply is in a separate little box inside the computer. The power supply has several circuits in them to instantly shut down if: 1) the voltage on the 12 or 5 volt supplies goes out of range (gets too high). A high voltage could mean an internal short from AC line to the output of the power supply (usually happens when a transformer breaks down). 2) the current demand gets too high. This could happen when a component fails and starts over-heating. If the PS didn't shut down, there could be a fire. With a CS generator or the Zapper or Beck style circuit, where there are electrodes open or directly attached (or held) to the body, a component failure could put full power line voltage directly onto the electrodes. Even transformers can fail -- including wall-warts. Luckily, in the case of these devices, the failure will put line voltage onto both electrodes at the same time. So someone would get electrocuted only if they're touching something that's grounded (like bare feet touching the ground) while touching the electrodes (or water in the case of CS). What you need, as a minimum, for your device is 1) an AC blocking capacitor (you probably already have this) in series with, 2) a very small fuse (10 mA) which it connected to 3) a 30-35 volt zener diode that goes to ground. If the voltage on the incoming power leg goes above the zener rating, the zener will conduct, blowing the fuse and protecting the circuit and people. > What kind of proof do you have that your HV machines make a >particle size so small that it can no longer be seen . I would conclude >that if it can not be seen it is because it is not there . You can measure the electrical conductivity of the colloid to determine the overall effectiveness. A specific conductivity with unseeable (non-Tyndall) particles will have thousands of times more particles than the same condictivity with seeable particles (because the particles are thousands of times smaller). -- Dean -- from (almost) Duh Moyn (CDP, KB0ZDF) -- 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] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
