Re: Regulated 9 Volt DC Power Supply


"Dave.H" <the1930s@xxxxxxxxxxxxxx> wrote in message
news:c9bc7c5d-9f59-415f-b19c-a724b60cfe13@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Dec 28, 11:09 pm, Chris <cfoley1...@xxxxxxxxx> wrote:
On Dec 28, 5:48 am, "Dave.H" <the19...@xxxxxxxxxxxxxx> wrote:



On Dec 28, 10:32 pm, Chris <cfoley1...@xxxxxxxxx> wrote:

On Dec 28, 4:38 am, "Dave.H" <the19...@xxxxxxxxxxxxxx> wrote:

Can anyone help me with information on building a 9 volt regulated
power supply that runs off 250 volts AC mains? Any help greatly
appreciated.

Thanks,
Dave

Hi, Dave. The easiest and safest way is to buy a wall wart.
Hobbyists and other newbies probably shouldn't be experimenting with
line voltage.

Mouser supplies a 9V 5 watt regulated DC output wall wart with a
variety of snap-on outlet plugs which will operate with all
international line voltages and frequencies for $12.82 ea. in single
quantities. It's their part number 552-PSA-05R-090-R

http://www.mouser.com/index.cfm?handler=home

Cheers
Chris

I can buy a 9 v regulated wall wart, rated at 800 mA, but as I'm on a
tight budget, I can't pay the $AU30 for it. I ALWAYS use extreme
caution around high voltage. I've worked around high voltage in old
valve radios, and learned to keep my hands away from energized
equipment, I'm pretty comfortable working around mains voltage. If I
build this PSU it will be in a plastic box.- Hide quoted text -

- Show quoted text -

OK, Dave. But if you're on a tight budget, you probably want to stay
away from home brew power supplies, unless you've got most of the
parts in your junkbox -- it'll still be more expensive to make it
yourself.

*** Smith Electronics has a new regulated 9VDC@600mA output wall wart
for A$7.98 as their P/N M9560. I'm sure you could scrounge something
at a local surplus outlet for less.

http://www.dse.com.au/

But if you're somewhat versed in electrical safety, and you've got
enclosure, line cord with strain relief, fuse and fuseholder, DPST
line voltage-capable switch, 12VAC secondary transformer that's good
for at least an amp and a half, 6 amp bridge rectifier, 2200uF 25WV
electrolytic cap and 10uF 16WV cap, you can buy an LM7809 from DSE for
A$1.20 as their P/N Z6550 to make your regulated 9VDC supply. Oh, yes
-- you'll also need a 6 to 10 watt heat sink for the TO-220 package,
as well as a bit of perfboard to mount the components. And mounting
hardware. And bumper feet for your enclosure. And some kind of light
to display that it's on.

Are you sure you want to go there?

Cheers
Chris

Didn't think it would be that complicated. I'll have a look around to
find the cheapest wall wart. Thanks for your help.

It's not hard to find wall warts that are being thrown away or sold
for 50 cents or $1 at yard sales. I have about 25 in a box ranging from 3v
to 24v, ac and dc.
If you really want to build one on the cheap, start picking up discarded
stereos, tv and microwaves, they have much of the hardware you need.
Mike


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