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Re: 123 bang under glass..pulsed fusor-setup

... neon trani color tv trippler The resistor is across the cap for safety but in a run it would connect to the top of the fusor. Simply charge ... to ten kv... a minute or so. To discharge the cap simply apply voltage to the nst primary then when the trippler hits 45kv... pow! The fusor ...
by guest
Wed Dec 04, 2002 7:46 pm
 
Forum: Fusor Construction & Operation (& FAQs)
Topic: 123 bang under glass..pulsed demo fusor
Replies: 4
Views: 1699

Re: NEON SIGN TRANSFORMERS - TROUBLE OR GODSEND

... many watts and thus stays relatively cool in operation. There is also a safety reason for the center tapped secondary.. When the arc has been struck in the sign tubing, the plasma voltage drops to only a couple hundred volts during each half cycle. By grounding the ...
by DaveC
Tue Nov 26, 2002 9:44 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: NEON SIGN TRANSFORMERS - TROUBLE OR GODSEND
Replies: 4
Views: 3848

Re: Grid

... as your coolant. Such systems have been used in the past on super high voltage anode systems in vacuum tubes. Some hydrogen thyratron circuits are ... decks are used to allow for cascading in special systems. Engineers and safety officers don't like this, but in some instances it has to be done. ...
by Richard Hull
Thu Nov 14, 2002 10:25 pm
 
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid
Replies: 13
Views: 2621

Re: safety/current limiting,ect?

Adding a fuse ahead of the circuit breaker is an excellent safety measure. One way you can control the output voltage of a Kenotron rectifier set, is to control the filament voltage. While filament control ...
by DaveC
Wed Nov 06, 2002 7:32 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: safety/current limiting,ect?
Replies: 6
Views: 2019

Re: safety/current limiting,ect?

hi doug
what dave says about the inductive limiting is true its ok for constant voltage but i would advise a fuse as well as a breaker as i have heard of breakers welding shut in high overcurrent so belt and braces would be good
cheers
colin
by guest
Sun Nov 03, 2002 1:16 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: safety/current limiting,ect?
Replies: 6
Views: 2019

Re: safety/current limiting,ect?

Douglas - I would recommend use of a variac set to quite low voltage to check out your new transformer. I am presuming from your description, that this is just the transformer portion of the HV unit - 220 VAC input, and 125 kVAC RMS output, center tapped. ...
by DaveC
Sun Nov 03, 2002 8:26 am
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: safety/current limiting,ect?
Replies: 6
Views: 2019

Re: safety/current limiting,ect?

... and grid design primarily control grid amp draw it would be a good safety margin obviously the voltage you are going to run at would also affect the ballasting cheers colin
by guest
Sat Nov 02, 2002 4:56 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: safety/current limiting,ect?
Replies: 6
Views: 2019

Re: power supply question

... If your variac does more than 110v then calculate the new high at that voltage. You will have to figure the turns ratio for that trani. The power ... possible when setting up your diode string and use a few extras for a safety factor. Larry Leins Fusion Tech
by guest
Thu Oct 10, 2002 2:12 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: power supply question
Replies: 2
Views: 1399

Re: pulsed fusor power issues

... be used that way, but the main concern is to increase the operating voltage and raise the crossection of fusion without building really hairy ... grid the onerous chore of a ultra high voltage feed thru is avoided. Safety would be easier due to the fact that the other end would be tied to ...
by guest
Sun Sep 01, 2002 1:24 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: pulsed fusor power issues
Replies: 16
Views: 3070

Re: Power Costs

... the load demands. In this case a total of 10uf @ 80kv (for a margin of safety) A large choke or huge current limiter resistor with a rating of at ... his old supply from a junk yard and killing himself with it. A high voltage, high current supply which would be of a modern switcher type with ...
by Richard Hull
Thu Jul 11, 2002 2:47 pm
 
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Power Costs
Replies: 3
Views: 2206
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