[600MRG] Power Supply Ideas

[John Molnar]

Steve,

You don't need a regulated supply for the Class D amp...a brute
force transformer, full wave bridge and a lot of filter caps will do the
job.

I run exactly that here at WG2XKA.  The transformer is key and it may be
flea market time.  I have a commercial filament transformer that was
originally
in a 10 KW FM transmitter.  Filter bank is 200,000 uF computer grade caps.
It's on a large variac, allowing instant adjustment from 0-500W out.  The
xfmr
was a flea market find.

With enough filtering (important) a regulated supply is not required.

73,
John XKA

On Mon, Feb 27, 2017 at 7:14 AM, Steve Flood <kk7uv at bresnan.net> wrote:

> I have built a Class D transmitter kit from G0MRF.  I am now in need of
> building or buying a power supply.
>
> Ideally I would like something variable from 18-24v, and linear regulated.
> The most likely operating condition for the supply will be 20v at around 6
> amps.   My existing Acopian supply is a fixed 24v/5A.  I see numerous cheap
> switching supplies on the web that operate 0-30v and 0-20A, but I am not
> fond of switching supplies.
>
>
>
> While looking at homebrew designs I see the use of three-terminal
> regulators
> such as the LM338 and pass transistors like the 2N3055.   These devices and
> designs are now seemingly becoming obsolete.
>
>
>
> I have not been able to find 'modern' homebrew designs on the web.  So I am
> now wondering if anyone in the group can steer me in the right direction.
>
>
>
> Thanks,
>
> Steve KK7UV/WH2XNV
>
>
>
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