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Re: 4000 watt Audio Amp to drive Tesla coil (fwd)



---------- Forwarded message ----------
Date: Tue, 11 Sep 2007 10:11:36 EDT
From: FIFTYGUY@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: 4000 watt Audio Amp to drive Tesla coil (fwd)

 
 
In a message dated 9/11/07 9:31:15 A.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:

>   Soooooooo, how and where in the world do I get a  source of 200 constant 
amps at 13.8 volts? This >is not your average power  supply you can plug into 
a wall.

    Depends on your plug.
 
    If you plug it into a 30A 220V single-phase dryer  receptacle, 4kW should 
be no problem.
 
    You can use a "buck/boost" transformer in an  isolating configuration 
(added bonus!) to get low voltage/high current AC, then  rectify. Big diodes are 
relatively cheap. You could use phase-controlled SCRs to  help regulate the 
average voltage, but it makes a brutal mess of an output  waveform when you need 
*clean* DC. This is what we've done to make 12V DC at  1500 amps for 
electrolysis cells. 
    Filtering will depend on your needs. Maybe you can  wind your own big 
choke on some scrap iron to save on filter cap expenses, as  you'd be looking at 
a lot of very big, very robust caps. But suitable choke  design is 
*non-trivial*.
    The MG set approach would be fine, using multiple  car alternators, but 
the problem is finding a 5 or 7-1/2 HP *single-phase*  motor. 
    In this kind of application, polyphase AC is your  friend. Maybe run a 5 
HP 3-phase motor as a rotary phase convertor, then use it  to drive the car 
alternators? You might be able to rectify directly from  the  other two motor 
legs (probably the cheapest and simplest approach,  worth a shot to try first?). 
You might be able to scrounge up an old 5 or 10 HP  3-phase motor that has a 
broken or irreparable shaft for cheap (scrap metal). 

 
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities



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