Excuse the spell check phone post you get the idea lol! Bill
On Monday, December 27, 2021 at 9:29:14 AM UTC-7 Bill Notfaded wrote: > Terry- > > Seeing your comment about PCB's made me remember a story about GE Electric > in Schenectady NY. A mentor of mine in WAN engineering worked there years > ago. He said they had huge pools filled with PCB's and techs would wade > out into the pool in waders to tend to the pools. He said one day someone > from GE environmental came around the office, where they had large > transformers mounted on walls above desks that sometimes leaked and > dripped. He said the pamper said their may be some side effects who > exposure. One side effect was it chipped turn your hair white. My buddies > hair was pure white... not silver. > > Bill > > On Saturday, October 30, 2021 at 5:22:49 PM UTC-7 Terry Bowman wrote: > >> On Oct 30, 2021, at 6:17 PM, Tom Harris <celep...@gmail.com> wrote: >> >> Which is why you use a string of them in series for this sort of thing. >> >> >> My old HV scope probe has a resistor in it that's several inches long. >> It's rated something like 40kV and several rings in front of the handle to >> prevent arc-over. Must be for checking the high tension in a TV set. I also >> have a small laser power supply that I bought as a kit at a hamfest around >> '93. The bleeder on it is almost as long. >> >> Like all laser PS kits I've seen the design is rather dodgy. The power >> transistor is only a TO-220 and the kit included a flimsy snap-on heat sink >> that gets too hot to touch in about fifteen seconds. I asked the seller >> about it and he said not to worry as the transistor was running within its >> heat spec. Right. When I can smell a transistor from across the room it's >> probably too hot. >> >> I retrofitted it with the most enormous vertical TO-220 heat sink I could >> find and even that got too hot to touch after a few minutes. Switching out >> the 0.5mW tube that came with the kit with a 0.25mW finally solved the >> problem. >> >> >> With appropriate insulation, I saw glass tube used in a physics lab. >> >> >> You can always fill the tube with transformer oil. Preferably the kind >> that doesn't have PCBs in it. >> >> >> Terry Bowman, KA4HJH >> "The Mac Doctor" >> >> Q: Should car stereo speakers be pointed to the rear for more thrust or >> up for more traction? >> >> A. On long trips, the 20- to 30% improvement in gas mileage you might get >> with speakers pointing to the rear is certainly worthwhile. On the other >> hand, if you drive on snow or ice, the extra traction of speakers pointing >> upward gives you added control. >> >> Don Lancaster >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/879453d2-f18f-42a0-a262-a964629f214an%40googlegroups.com.
