Kenny:
>Does anyone know of a source for a lightweight switching power
>supply that is 12v 120a? The goal is to use a switching power
>supply on a mobile amplifier.
The highest I have seen here is 60A at 12V, I wonder if they can be run in
parallel?
>Also looking for a switcher that is in the range of 48v 48a.
This is easier to do but I suspect that you wont like the result much for
portable operation. I have several 48V switching supplies here, they are
all rated at 40A BUT that is the good news. The bad news is they weigh a
great deal - far more than I suspect you are interested in carrying
around. They are CONTINUOUS duty units as used in NORTEL PBX's, and even
for switching supplies they a very heavy. In preparation for sending you
this email I opened one up, the case alone weighs about 23 lbs of
aluminum, the big heatsink weighs in at 30+ lbs and the four seriously
large transformers and inductors weigh in at nearly 45 lbs. Having reached
nearly 100 lbs I suspect you are loosing interest fast.
For my 8.998 kHz transmitter I am using a large VARIAC feeding a new supply
here, 340V Max at 40 Amps. I was using a switching supply at 240V at 40A
but it had a hard time with the no load/full load change during key up/key
down operation. For those who dove for their four banger calculators on
seeing the above, the Radio Act stops here at 9 kHz on the way down.
Larry
VA3LK
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