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Author Topic: Computer power supply to power handheld  (Read 371 times)
WA7UNW
Member

Posts: 71




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« on: March 14, 2005, 06:26:42 AM »

Has anyone out there tried to use a computer power supply to power a radio? Is the power clean enough?
The 12V supply is anywhere from 10-15 amps. Would I need a filter capacitor to smooth the voltage?

Mike
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WB6BYU
Member

Posts: 13171




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« Reply #1 on: March 14, 2005, 01:22:24 PM »

There are a number of possible problems that you may
encounter, and it will depend a lot on exactly which
supply you are using.  If you do a search in the Elmers
forum you should find a lot of information (though there
is no guarantee that everyone will agree!)

Some of the issues:

Many supplies require a minimum load on the supply (often
on the 5V side) for the supply to work correctly.

Computer supplies are typically designed for continuous
loads.  Some don't like sudden changes in current draw
(for example, when you key the transmitter).  Others do
fine.

The output is often 12V rather than the 13.8V that
many mobile rigs really need to make their full rated
specifications.  Check the manual on your handheld to
see what the allowable voltage range is for it.

If you are just using a hand-held, it probably doesn't
draw more than 1 amp.  You probably can make it work,
though it may not be as simple as it might appear.
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TOASTY
Member

Posts: 41




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« Reply #2 on: March 17, 2005, 11:38:53 AM »

i used 3 computer psu's connected in series to power my mobile radio, just had to get a voltage regulator to get it a little lower than 15vdc, other than that it works great
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