[Elecraft] Homebrew power supply question.

[Don Wilhelm]

Mark,
You can make it a bit easier on yourself by looking at the design in QST Nov
1993 p.27. by Bill Spencer G4YNM.  The circuit board is available from FAR
Circuits, and has adjustable voltage and overvoltage pots (crowbar circuit)
on the board.  It uses an LM338 regulator, so it is good for up to the
limits of the LM338 and the heat sink you use.  5 Amps is the likely max but
I use mine at 4 Amps max due to the transformer I use.  I use one of these
to power my K2 with no problem.
73,
Don W3FPR

----- Original Message -----
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| I am building a homebrew linear power supply for my K2, and need a little
help with coming up with a design that I like.  I have been looking at a
power supply at the following website:
http://www.mitedu.freeserve.co.uk/Circuits/Power/1230psu.htm    It's simple
and I think it will do the job, but I would like to make it adjustable and
still keep it simple.  I have seen some variable power supplies using the
famous LM317T and LM350T,such as:
http://www.uoguelph.ca/~antoon/circ/vps.htm, but they are for low current.
My question is, do any of you engineer-types out there in Elecraft land
think I could incorporate a combination of these two circuits by using the
design of the aforementioned second power supply and adding the high current
transistor array of the first power supply?  I also plan to add a crowbar
protection circuit on the output.
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