I, for one, would go for it!
I've had experience with SMPS: the primary side is within reach of everybody
who ever fixed or modified a PC power supply.
The secondary side is more problematic because of the high voltages involved
and the need for good isolation.
It doesn't even need to be stabilized too well, since dynamic range is more
dependent on the output capacitors than on the PWM.
Can anybody send me the schematics in effect now? I'd like very much to see
them.
73 and all the best!
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of KD7QAE
Sent: Wednesday, May 20, 2009 11:01 PM
To: Paul Decker
Cc: amps@contesting.com
Subject: Re: [Amps] Source wanted for HV switch-mode power supply
Paul,
Once you get it working, it would be straight forward to lay out a few
PC boards so others could do what amounts to a kit build. I would
suggest a primary module with a separate PWM controller board that
mounts to it with a single row Berg header and a secondary module to
handle the rectifiers and filter components. That's 3 easy to build
boards. I wonder how many folks would be interested in a build it
yourself kit based around pre wound transformers adn these boards and parts?
Tomm, KD7QAE
Paul Decker wrote:
> Hi Mike,
>
>
>
> Yes, Tim Hulick, W9QQ went SK in late 2007, he was the owner of
wattsunlimited.
>
>
>
> Over the past few months, I have been building a HV switch mode power
supply based on his February 1991 QEX article. I haven't quite gotten to
the stage of actually powering it up with full voltage yet, but I am close
(this weekend looks good!). A ll the components are wired up in their
respective modules. If you do a search, you can probably dig up the
article. If not, let me know.
>
>
>
> Not to talk you out of it, but to be honest, for me, if I were to do it
again, which I hope I will, I would go for a linear power supply unless
there is a dire need for weight control. The switcher I am implementing is
very simple, but still far more complicated to build than the traditional
power supplies.
>
>
>
> Regards,
>
> Paul, kg7hf
>
>
>
>
>
>
>
> Message: 3
> Date: Tue, 19 May 2009 15:40:43 -0500
> From: mikea < mikea@mikea.ath.cx >
> Subject: [Amps] Source wanted for HV switch-mode power supply
> To: amps@mikea.ath.cx
> Message-ID: < 20090519204043.GA897@mikea.ath.cx >
> Content-Type: text/plain; charset=us-ascii
>
> (maiden post here)
>
> I've just got a Burle 8791, socket, chimney, and whatnot, and am looking
> hard at building an amp. Does anyone know a good source for a suitable
> switch-mode power supply -- 2500 V DC at about 750 mA?
>
> I've talked with Ralph W5JGV, but he's going to be taking care of a
> medical disaster for some time and not able to do custom construction.
> I really want to avoid big iron if possible, to keep cost and weight
> down. If at all possible, I'd like one that can be turned on when I hit
> the mike switch or key the first DIT or DAH, rather than one that takes
> a few seconds to soft start. Watts Unlimited had precisely what I want,
> but the proprietor appears to have gone SK.
>
> I'll also be looking at 2 KV supplies at .5 and at .25 A for a VHF amp
> (2 x 4CX250B) and a UHF amp (single 4CX250K) later on.
>
>
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