[Elecraft] Power Supply

Tue Jun 10 14:26:01 2003

Mark,
   You might want to consider building a regulator to put between the output
of the supply and your K2/100. Since it outputs 15.5V no-load, you have some
room to play. Target a 12V output, figure out what current you need, and
design a series regulator to handle it (just make sure you have plenty of
tolerance on the pass transistor rating and heat dissipation! If you get a
clean 12V, you could try for 13V, but I don't think you'd get much above it.
Do you have access to an oscilloscope? If so, you can find out extremely
quicly what the output of your GE supply looks like by just connecting up an
appropriate high wattage load and checking for ripple. If the ripple goes
below 9V at the current you need, then you cannot use the supply. If it
stays higher, then you stand a chance of regulating it.

73,
Michael, WH6AH
----- Original Message -----
From: "Mark Baugh" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 10, 2003 07:48
Subject: [Elecraft] Power Supply

>
>
> I finished my K2 a couple of weeks ago and it is working great, and I love
it!  Now, I just received the KPA100 yesterday and have started construction
on it.  My question is that I have stumbled upon an old GE power supply
rated at 35 amps, and it is really built hefty.  However, it is unregulated
and puts out 15.5 VDC with no load.  I would not expect the voltage to drop
much when loaded with my K2/100, but I know the manual says the operating
voltage should be between 9 and 15 volts.  Will the 15.5 volts be too much,
and would the unregulated output present any problems?  I would love to use
this thing because it is filtered so well and looks to be built like a tank.
Note:  It came out of a commercial two-way radio repeater station.
>
> Mark, WB4MSD