two 25 amp radioshack switching supplies
 

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

Did you isolate the supplies with high power diodes?? Or run each amp on
it's own power supply.

Bob N9LVU

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

Did you isolate the supplies with high power diodes?? Or run each amp on
it's own power supply.

Bob N9LVU

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

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?

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?

All you need is 2 25amp diodes and hook up so it looks like one half of
a4 diode full wave bridge rectifier, or it looks like a 2 diode full
wave bridge rectifier. The output is positive, and the input of each
diode is the positive output from each power supply.

in + |
\
+ out
/
in + |

pos from power1 to diode | output tied to second diode output
common output is positive at amp/power1 + amp/power2
pos from power2 to diode | output tied to first diode output

I would still supply each amp separately, due to voltage requirements.

Bob N9LVU

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?

All you need is 2 25amp diodes and hook up so it looks like one half of
a4 diode full wave bridge rectifier, or it looks like a 2 diode full
wave bridge rectifier. The output is positive, and the input of each
diode is the positive output from each power supply.

in + |
\
+ out
/
in + |

pos from power1 to diode | output tied to second diode output
common output is positive at amp/power1 + amp/power2
pos from power2 to diode | output tied to first diode output

I would still supply each amp separately, due to voltage requirements.

Bob N9LVU

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?

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)

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)

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)