rhkra...@gmail.com: > On Tuesday, February 21, 2017 08:37:11 AM Dan Purgert wrote: >> GiaThnYgeia wrote: > ... >>> Never a good idea, there are cheap tools of measuring current, a short >>> can blow a good power source/transformer. How do you check industrial 3 >>> phase 440V, just ground it with a train rail see if there are any sparks. > > I agree that giving advice like touching the switch pins with a screwdriver > is > a bad idea--among other things, somebody might "learn" from that and try it > under more dangerous circumstances.
I was not referring to the human danger when I advised against it, although there have been sensitive people who have passed away due to heart failure with minor shocks. But, imagine having no switches and bare wires everywhere and you just twisted them to close a circuit. Also, welding machines exist for a reason, otherwise you can do welding ideally with what comes out the shocket/mains with 110/220 50/60hz and the right electrode for the right material. Switches are good for making sufficient contact abruptly and almost instantly, for a reason. A chinese v/a/Ω meter costs as much as a sandwich and lasts a lifetime of abuse (maybe get three to have a good one). A battery voltage and the circuitry of transforming mains AC to various DC are not the shame. The worst a battery can do is blow up in your face or get discharged. Try finding a replacement diode at your neighborhood store. Sometimes in modern boards the contacts of the cpu to the board make all the difference and unless there is a led coming on somewhere it may seem as a dead board even with current running. lap/Notepads are notorious for pretending they are dead. They are tons of good motherboards on landfills. -- "The most violent element in society is ignorance" rEG