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Text 2003, 50 rader
Skriven 2005-08-18 17:41:26 av mark lewis (1:3634/12.0)
   Kommentar till text 1996 av WAYNE CHIRNSIDE (1:123/140)
Ärende: NASA, shuttle, anyone?
==============================
->  WC> Being a tad paranoid about such things I used a series high 
->  WC> value
->  WC> resistor in series with a lower value one with a neon bulb 
->  WC> across the smaller resistor as a visual indication of discharge. 

-> do you have a schematic? 
    
 WC> Nope I worked it out with ohm's law years ago, rather simple. 

well, heck, i could do that, too... i just thought i'd try something that has
already been designed, built, tested, and used successfully... who needs more
feathers, anyway O:)

 WC> No longer have it and anyway the resistors were in shrink wrap.    

if i were to create one, i'd definitely be putting the assembly inside
shrinkwrap...

-> sounds like something that would definitely work... especially with 
-> an indicator that the is no more charge stored in the tube... that's 
-> always been my biggest fear... and why i ground the tube even after
-> discharging it... i don't like the stuff building back up and 
-> surprising me, either ;)

 WC> You should have seen me jump when I built a HV power supply
 WC> with 25KV and enough current to light cardboard afire in under a
 WC> second across a 3/4 inch gap.

 WC> It stayed in a drawer unused after that until I moved and tossed it
 WC> in the trash.

 WC> Took me 90 minutes to build on the cheap.

i hear ya... i have a self built power supply that uses a transformer from an
old pinball machine... several bridge rectifiers on it off the taps... one tap
is rectified to an 8 pole double throw high voltage relay that controls power
to all the other outputs with one set of contacts used to short the huge filter
capaciters across some resistors to drain them when the power is off... when
the power is on, the caps filter the main 12 volt supply voltage... it was just
something that i threw together to power 12 volt stuff on my bench and i
decided to also tap off 5 volt for some digital stuff as well as a few other
voltages needed for those circuts... i even had a computer connected to it at
one time using it for the power supply instead of a switching supply like we
more commonly see... worked great and handled everything that that system
needed power for... AIR, i still had enough capabilities to connect in a car
radio for some music O:)

)\/(ark

 * Origin:  (1:3634/12)