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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) |
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?" |
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 |
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Even with diodes, it is often the case that one supply will hog all
the current while the other one loafs, as the output set points of both would never be exactly the same. The easiest way to deal with the problem is to hang a boat battery on one supply to float. Unless you are going for the Neil Young sound, the average will be lower than the peak, allowing the battery to absorb a lot of the peak current with one supply operating quite efficiently. It may be difficult to truly separate the two amps with their own separate supply as this may lead to ground loop problems, but if you can tie the grounds together, you might not. Another approach would be to check out E-bay for a good clean used integrated amp. Jim "Robert Kubichek" wrote in message ... 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? |
Even with diodes, it is often the case that one supply will hog all
the current while the other one loafs, as the output set points of both would never be exactly the same. The easiest way to deal with the problem is to hang a boat battery on one supply to float. Unless you are going for the Neil Young sound, the average will be lower than the peak, allowing the battery to absorb a lot of the peak current with one supply operating quite efficiently. It may be difficult to truly separate the two amps with their own separate supply as this may lead to ground loop problems, but if you can tie the grounds together, you might not. Another approach would be to check out E-bay for a good clean used integrated amp. Jim "Robert Kubichek" wrote in message ... 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? |
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