[Amps] power supply transformer

[kg7hf at comcast.net]

Would that be 28v AC @100 amps?    Then use a voltage tripler to get to 119?


-------------- Original message -------------- 
From: "Phil Clements" <philc at texascellnet.com> 

> I have a Collins 28 volt 100 amp power supply here in great condition. 
> Someone make me an offer I can't refuse.... 
> 
> 
> (((73))) 
> Phil, K5PC 
> 
> 
> > -----Original Message----- 
> > From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On 
> > Behalf Of Michael Tope 
> > Sent: Wednesday, January 31, 2007 12:15 AM 
> > To: Tom W8JI; kg7hf at comcast.net; amps at contesting.com 
> > Subject: Re: [Amps] power supply transformer 
> > 
> > 
> > ----- Original Message ----- 
> > From: "Tom W8JI" 
> > 
> > > 
> > > You should use a transformer for a few reasons (as was 
> > > already covered) like line surges and safety. It is against 
> > > code to EVER ground a neutral to anything connected to 
> > > something external, so the neutral has to float. You could 
> > > float the entire negative rail from chassis, but then the 
> > > issue becomes spikes from the power line into the PA and 
> > > harmonics from the rectifiers into the power mains. You 
> > > certainly could design a system that would use the power 
> > > mains safely and not break codes, but it would require some 
> > > care. 
> > > 
> > > The real problem is knowing the ESR of the transformer. 
> > > Certainly it isn't as low as it could be because of the fact 
> > > it is a control transformer, but a choke input would help a 
> > > lot. You could get a power factor close to unity rather than 
> > > the very poor power factor of a capacitor supply, so you 
> > > might be OK if the choke is a good one. 
> > > 
> > > 73 Tom 
> > > 
> > 
> > Sounds like a good application for a switch-mode supply. 
> > 
> > Mike W4EF.............................. 
> > 
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> 
>