[R-390] 400hz

[Bob Camp]

Hi

Well for anything in the couple KVA range you are not going to get 
there with a couple of junk box filament transformers. Small stuff will 
work fine that way but I think you are in trouble past a couple hundred 
watts.

Probably the best bet for a home brew lash up would be to bulk rectify 
the 220 and then use an H bridge with some large FET's to get a 400 Hz 
square wave off of the result.

Of course at those power levels a mistake would get pretty expensive 
pretty fast ....

	Take Care!

		Bob Camp
		KB8TQ


On Aug 17, 2004, at 8:00 PM, Bernie Nicholson wrote:

> Ok Rube you are generating 400 hz ac but the max power that you can 
> get from a auto alternator is about is 520 watts devided by 3 will 
> give 170 watts per phase  NOT enough !!! a arc58 system needs at least 
> 3.5kva and a 618 system needs 2.5kva , even a big truck alternator 
> will only deliver about 1kw , I have run these systems my making a 
> regular psu and the only things that need 400 hz are the servo systems 
> and you can get away with 20 watts for these but major surgery has to 
> be resorted to in the radio  ,regards to everyone on the site
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