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 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
>>
>>
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