[AMPS] Transformer ++

[jeff millar]

How about a switch mode power supply that drops 120-0-120 full wave
rectified down to 50 volts?  This will require a switcher chip, some hefty
FET's and a high frequency, high power choke but no transformer.  Using the
240 feed as a 120 each side of center and two big diodes to rectifiy it will
produce about 150V.  The switcher chip will track the 120 Hz power ripple
fairly well, just use enough filter C to hold the voltage to about 60-70 V
minimum.

If you're interested, I can help with figuring the values and selecting
parts.

jeff, wa1hco


----- Original Message -----
From: Alex Von Yonkers <avy@qwestonline.com>
To: <amps@contesting.com>
Sent: Saturday, March 24, 2001 5:07 PM
Subject: RE: [AMPS] Transformer ++


>
>
> Speaking of transformers. I'm building an amp based on four MRF157
> Transistors from Motorola.
> I need to build an Power Supply able to deliver 50A at 100A or two of
> 50V/50A. I have called several transformer manufacturers but I almost
> had an hearth attack when told about the prices.
>
> Any good idea?
> Alex
>
> PS. Do you think that there could be a market for a 2KW+ solid state amp?
>
>
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>
>


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