[R-390] Ballastubes (was inrush current limiters)

Tue, 24 Dec 2002 14:31:50 -0800

Please forgive me, I'm still at work, and irritable.

Some of you have not been convinced by arguments.
One demonstration is worth a thousand speculations.

It's a simple circuit.  Please, just put it together and try it.
Report the FAILURE back to us so we can drive a stake through it.

Thank you!

Merry Christmas to all and to all a good night,
Dave Wise

> -----Original Message-----
> From: Bill Smith [mailto:[email protected]]
> Sent: Tuesday, December 24, 2002 1:55 PM
> To: Jim Shorney; Cecil Acuff; [email protected]
> Subject: Re: [R-390] Ballastubes (was inrush current limiters)
>=20
>=20
> Haven't tried it yet, but seems simple enough:
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> Why not made a 300ma current source (zenner, two resistors,=20
> transistor, or
> your improvement) and hook it up to the +/- terminals of a=20
> bridge rectifier.
> Hook the AC terminals of the bridge rectifier to pins 2 and 7 of the
> ballast.
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> The current source always sees DC, and the circuit works in=20
> the AC line of
> the filament string.
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> Merry Christmas and Happy Holidays!
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> 73 de Bill, AB6MT
> [email protected]
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>=20
> ----- Original Message -----
> From: "Jim Shorney" <[email protected]>
> To: "Cecil Acuff" <[email protected]>; <[email protected]>
> Sent: Tuesday, December 24, 2002 1:06 PM
> Subject: Re: [R-390] Ballastubes (was inrush current limiters)
>=20
>=20
> > -----BEGIN PGP SIGNED MESSAGE-----
> >
> > On Mon, 23 Dec 2002 21:58:34 -0600, Cecil Acuff wrote:
> >
> > >You arrived at peak value by half wave rectifying the Peak=20
> to Peak sine
> > >wave.  You now multiply that value by .707 to get the RMS=20
> value.  To go
> from
> > >RMS back to Peak you multiply by 1.414 and then double=20
> that to get Peak
> to
> > >Peak values.
> >
> > That doesn't apply to the output of a half-wave rectifier.  It only
> > applies to a pure sinewave or full-wave rectified sine wave=20
> (allowing
> > for diode voltage drop if you're dealing with low=20
> voltages).  As Drew
> > pointed out, the RMS value of a half-wave rectified sine wave is
> > .5*peak.
> >
> > - --
> > Jim Shorney      -->.<--Put complaints in this box
> > [email protected]
> > [email protected]
> > Ham Radio NU0C
> > Lincoln, NE, USA
> > EN10PT
> > http://incolor.inetnebr.com/jshorney/
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> >
> >
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>=20