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Rectify ac input?
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From: Thomas McGahee [SMTP:tom_mcgahee-at-sigmais-dot-com]
Sent: Sunday, March 01, 1998 4:44 AM
To: Tesla List
Subject: Re: Rectify ac input?
> From: Homer Lea [SMTP:HomerLea-at-aol-dot-com]
> Sent: Sunday, March 01, 1998 8:32 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Rectify ac input?
>
> In a message dated 98-02-28 17:10:19 EST, you write:
>
> > > I have often wondered, and want to try, rectifying the ac
> > > input to the transformer primary with a full wave bridge. You'ld still
> > > get 120 pps, (60 hz x 2), but they would be all positive, (or negative).
> >
> > > I'm not sure the transformer characteristics would be to happy about it
> > > as you'ld basically be feeding the primary unfiltered dc. Current might
> > > go through the roof.
> >
> If I remember right from school(30+ years ago): If you put the 120 volt line
> current through a full wave bridge what you get out is essentially a 60 volt
> 120 Hz signal on top of 60 volts DC. The current from the DC component should
> be large enough to saturate the core and give just a tiny 120 Hz AC current
> out the secondary. On the other hand if you put the xfmr OUTPUT through a
> rectifier bridge you get a nice 120pps to your spark gap and coil primary.
>
> jim heagy
>
Jim,
Nope, that 120 VAC RMS when rectified will be 120V*1.414 in peak amplitude,
and will have *NO* pure DC component. It is 100% pure ripple. You will get
a DC bias ONLY when a capacitor is added. You are right about the frequency,
however. It will be 120Hz. Note that it is *not* sinusoidal once it is
full wave rectified.
Hope this helps.
Fr. Tom Mcgahee