David: I tried this circuit on a large power supply. The problem with it
is that it turns the primary on - off on a regular basis. lots of bang -
bang - banging of the transformer. I removed it from the supply.
Wayne N1WR.
Date: Fri, 12 Feb 2010 06:55:09 -0500
From: "David C. Hallam" <dhallam@rapidsys.com>
Subject: Re: [Amps] step start /triacs/Line Side Regulator
To: Jim Thomson <Jim.thom@telus.net>
Cc: amps@contesting.com
Message-ID: <4B75419D.9060004@rapidsys.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
In the October 1987 QST there was a construction article for line side
proportional control regulator for a high voltage power supply. Its
purpose is to prevent the HV from soaring under idling conditions when
the tube was not drawing current. The circuit uses a comparator to
sample the HV and turn a triac in the primary of the transformer either
off or on depending up the relationship of the sample to a reference
voltage.
I don't think I have ever seen this circuit implemented in any designs
or any discussion about it. I am building a new amp and was thinking
about using it. Is it a good idea or are the draw backs to it?
David
KW4DH
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