No, because you would NOT get seperation of the supplies.
If you hooked up the supplies to the 2 ac legs of a 4 diode full wave
bridge, the supplies would be connected through the two doides that make
up the negitive half of the bridge, only by using 2 diodes will you get
true isolation. All you need to do is isolate the positve outputs of the
supplies, the negitive can be wired together.

Bob

wrote:
so i could buy one of those a4 rectifiers (this one?)
http://www.radioshack.com/product.as...Fid=276%2D1185
and then use one half for one amp, one half for the other? (I have
already opened the powersupplies up and tweaked their voltages a bit
(14.4 volts instead of 13.8)

In article .com,
says...

Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

Why in the Multiverse would you need that much audio power in your
room?

Do you have no concern for the quality of your hearing in later
life?

sigh Ahh, well... You need to diode-isolate the supplies, as has
been pointed out. I would add that it may be a good idea to use Schottky
power devices as opposed to generic diodes. Schottkys have a much lower
forward voltage drop.

Run the positive lead from each supply to the anode side of one
diode. Tie the cathode side of the diodes together, and take your common
positive output from there. The ground leads may be tied together
without isolation.

Good luck. Hope your neighbors don't object to the noise.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"

In article .com,
says...

Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

Why in the Multiverse would you need that much audio power in your
room?

Do you have no concern for the quality of your hearing in later
life?

sigh Ahh, well... You need to diode-isolate the supplies, as has
been pointed out. I would add that it may be a good idea to use Schottky
power devices as opposed to generic diodes. Schottkys have a much lower
forward voltage drop.

Run the positive lead from each supply to the anode side of one
diode. Tie the cathode side of the diodes together, and take your common
positive output from there. The ground leads may be tied together
without isolation.

Good luck. Hope your neighbors don't object to the noise.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"

wrote in message
oups.com...
Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!


Yes, this would be possible but not the best choice.

Check out the Astron power supplies, in particular the RS-70M.
It should provide sufficient power, is very well regulated.
Google will find them for you.

--

... Hank

http://horedson.home.att.net
http://w0rli.home.att.net

wrote in message
oups.com...
Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!


Yes, this would be possible but not the best choice.

Check out the Astron power supplies, in particular the RS-70M.
It should provide sufficient power, is very well regulated.
Google will find them for you.

--

... Hank

http://horedson.home.att.net
http://w0rli.home.att.net

Motorhome accesories include the use of 2 batteries with diodes. So check
with some local motorhome dealers.

--

73
Hank WD5JFR
wrote in message
oups.com...
Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

-Matt

Motorhome accesories include the use of 2 batteries with diodes. So check
with some local motorhome dealers.

--

73
Hank WD5JFR
wrote in message
oups.com...
Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

-Matt

On 2 Jan 2005 18:38:44 -0800, wrote:

Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

-Matt

Yes, you just need a diode in series with each power supply's output
so they are isolated from each other. Schottkey diodes are
recommended for the lower voltage drop (and less power lost).

On 2 Jan 2005 18:38:44 -0800, wrote:

Is it possible to run two radioshack switching supplies in parallel? I
have tried it however one always seems to shut down, so i would only be
getting 25 amps max. I need all the amperage I can get because I am
running two car audio amplifiers in my room... Thanks for any advice
or instructions!

-Matt

Yes, you just need a diode in series with each power supply's output
so they are isolated from each other. Schottkey diodes are
recommended for the lower voltage drop (and less power lost).

On 2 Jan 2005 18:53:36 -0800, wrote:

I just had two powersupplies and ran the cables together so a simple
way of putting it would be that I have an amp, and i took the + from
both powersupplies, and put them to the + on the amp and the same with
the -. do you think it would work for me to get some bridge rectifiers
from radioshack? (25 amp bridge rectifier is $3.50 or something like
that,) get 2 of them and isolate each powersupply?

Go to your local auto supply store and get a reverse-polarity
two-battery isolator. Tell them that you are running a
positive-ground British RV or something exotic like that. These
devices exist but they have to be ordered from the warehouse. They
consist of two horse-size diodes mounted on a heat sink with nice
big screw terminals. There should be a clear hook-up diagram with
it. This will be cheaper and easier than buying the components and
manufacturing the device yourself.

Connect one P/S to one input, and the other P/S to the other input.
Connect the load (amps) to the output/common. Warning - if one
supply has a slightly greater output voltage than the other, that
one will pick up the whole load. Digital metering of each supply's
output and the load voltage (nominally 0.7 V below the supply
voltage) is important.

That's how I run my communications center, with a big marine
gel-cell battery floating on the DC bus (13.8 V). Haven't had a
problem in five years' continuous duty.

--
73 de K2ASP - Phil Kane