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Re: [Amps] thyristor controlled soft start?

Subject: Re: [Amps] thyristor controlled soft start?
From: Radio WC6W <>
Date: Fri, 21 Mar 2008 10:29:56 -0700 (PDT)
List-post: <">>
Hi Andy,
  Are you thinking about just replacing the relay
across the resistor with a Triac?  Or something more
involved like a phase controlled ramp??

  A Triac will exhibit a considerable loss during
normal, post startup, operation.  I've seen circuits
where a Triac is used with a relay connected in
parallel.  The Triac is first enabled, then shorted by
the relay.  This greatly reduces contact wear on the
relay while avoiding the typical 2V drop of a Triac.

73 & Good morning,
  Marv WC6W

--- Andy GD0TEP <> wrote:

> Hi group,
> I'm thinking about using thyristor controlled
> softstart on my amplifier PSU
> transformer for my next project, is there anything I
> should be concerned
> about using this type of softstart?


> Cheers,
> Andy

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