grapher

Can anyone furnish a url where I can get instructions and parts list for a
DIY 12V power supply for charging my electric power packs. I use a Robbe
Infinity II which would require I think, a psu capable of delivering say 8A.
I would be interested to know what commercial types there are for sale in
the UK and where they can be bought.

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kevin r

I would not bother trying to build one for £25 you can have a 10amp one
http://www.alshobbiesstore.com/acatalog/Power_Supply.html

nik beard

I guess there are many to choose from but I use a Palstar PS-30 unit from
Maplins. It has a variable voltage setting from 3-15volts at up to 30 amps
costs about £120, Fan cooled and F$%*^£
Heavy!!http://www.palstar.co.uk/Palstar-PSU.html
This was bought to be able to charge battries of over 8 cells at the same
time.
For example with my Supernova set to charge 8 x 9.6v cells at 5 amps, it
will draw 5 amps from a 12 v supply i.e a car battery. If I insert another 8
cells in series to give 16 cells at 5 amps, the Supernova will draw 10 +
amps because the input voltage is the same 12v. I tried 18 cells and this
power supply really rocked!!
Dont ever try to charge lots of cells from your car battery :-(((

The unit continues to punch out the important amps when I need them!

I can scan and email the Instruction manual to if it would help.

greg middleton

I'm not having a go at you but if you need to ask for the design of a simple
DC power supply you don't know enough about electronics to be building
something mains powered, it's too dangerous. The 'book' on safety for mains
powered equipment is literally 200 pages of very complicated technical stuff
by the name of EN60950, believe me by the time you know enough to build
something safely you won't have to ask how to design a simple DC power
supply. There are lots of designs to be found on the net but almost all
leave the safety aspects to you, mainly because the person publishing it
knows no better!.

Buy a 13.8V 'CB' type power supply from Maplin etc and let someone else
worry about safety, you probably couldn't make it for less anyway.

Greg

grapher

Thanks guys - that's enough to convince me I should buy one!

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grapher

Choice is a dreadful thing! Looking at the Maplin CB psu's, do I get the 7A
or the 10A. When it says "50% duty cycle rated output current" does mean
that effectively a 10A unit is rated in use for 5A?
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kevin r

a CB psu does not need to be 100% rated as you switch between talking at
high power and listening which is low power did you look at Al's hobbies a
10 amp psu is only £25??
Kevin

stew

Find an old PC power supply in a skip or somewhere for free and convert
it! usually good for 10+ amps, look at reds battery clinic for the
instructions on how to do this,

With the PC power supply, my supernova can charge 16 F 8000mah ni-cad
cells at 5A for hours on end effortless.

philip rawson

I'll second this... I've got several dotted around the place, very useful
for mini drills and workshop use too...

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Philip Rawson

http://www.flymodels.co.uk
http://www.aeromodeller.org

paul mcintosh

You can buy computer power supplies that will easily provide that kind of
power. Look for a 400 watt supply. The output labels will tell you how
much current each portion of the supply will provide.

I bought a computer case with a 400 watt power supply included for 26 pounds
at a local computer fair. The 12v section of that is 10 amps.

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Paul McIntosh
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