Thanks. You've got me started.
Ed
----- Original Message -----
From: Jerry Flanders <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 02, 2000 13:34
Subject: Re: [VAC] Univolt Converter
> For what it is worth, I once opened up and repaired one from a '76. It
used
> the "ferroresonant" regulation principle - you might be able to look that
> up if you want to read up on it.
>
> Briefly, this type of regulation circuit depends on establishing a
resonant
> circuit (the combination of the transformer AND the capacitors inside it)
> and a saturated magnetic circuit (the physical design of the transformer).
>
> What happened in mine was that one of the two capacitors failed, upsetting
> the resonant condition. I replaced it by going to an electrical supply
> house and getting a new capacitor of the proper electrical specs and
> installing it. That made it work OK.
>
> I could never understand why the manufacturer recommends against working
on
> these in the field - they are not very complicated.
>
> The part of the circuit that I could work on was so obvious a schematic
> would not really have helped - there were only 2 or 3 components in the
> entire box, and you could see just what hooked where.
>
> BY THE WAY: If mine failed today, I would probably convert it over to use
> one of todays easily available 13.8 VDC adjustable power supplies intended
> to power Ham radio stations. I have one in my ham radio station made by
MFJ
> (www.mfjenterprises.com - list price is maybe $150) that puts out 35 amps
> and is adjustable up to maybe 15 volts. It is highly regulated and puts
out
> extremely clean DC with only a few millivolts of ripple. It is metered
both
> for voltage and current, and is much quieter than the univolt. I have not
> yet looked into what is required to use it in this application - a
blocking
> diode on the output may be needed.
>
> Jerry W4UK
>
>
> At 01:01 PM 6/2/00 -0700, you wrote:
> >Does anyone out there have a schematic diagram for a Univolt Converter
found
> >in a 1975 Airstream International 29' ?
> >
> >Ed
> >
> >
>
>
