I have a family now, so my sound system is way smaller...:cry:

http://i189.photobucket.com/albums/z...n/DSCF0438.jpg

Maybe not then.. Found out my box is a Bandpass enclosure... if that means anything..

Sounds good in my 01' Kia sportage...

naah, it could be your amp. These woofers need some power to sound good. I would stick some pillow stuffing in your box. It could be that your box is leaking air if the woofers are in their own chambers. I also use to add dynamat inside the box itself.

Here's a link of the box that holds 4 of those woofers. http://www.cardomain.com/ride/426334/2

what about this power supply...

http://www.rc-monster.com/forum/showthread.php?t=28031

Cleaned up my wiring, put an anderson 50amp connector on it(same one I use in my car) for quick changes
http://i152.photobucket.com/albums/s...s/PICT0197.jpg

Looking good BB.

I remember having a box like yours in my room. I had it setup in a corner with the ports firing up. Chicks like sitting on the plexiglass while the music booms.

Lol Ill try that. what power supply were you running back in the day ?

I use to run a bunch of caps with a cheapo car battery charger. Worked out great.

Thanks for this thread Snellemin. I got hold of one of these HP PSU's for $50 AUS off Ebay and it was local pickup. Works well and is a lot smaller than I thought it would be. Heaps better than the multiple 100's I would have had to spend to get the same current from a commercial PSU. Mine gets 12.48v no load.

Brow

I was in the same boat man. I was seeking a simple high quality 40+A 12V power supply without breaking the bank. I also didn't want to spend too much time hacking a regular computer power supply. Nice thing is, that I work at HP and have access to the Server group and PSU group. I got to open a few PSU's up and asked the designers and engineers what the limitations where and what not. I went on Ebay and started inputting different HP part numbers and found the older stuff to be dirt cheap and easy to mod. Easy as in, not having to open up the Power Supply at all. I also found that some people on rcgroups have used the same power supply I have listed. I figured that 47A PSU is more than enough for the majority of the people and $20 dollars is more than affordable for nearly anybody in this hobby.

i needed 90 Amps
for the sound in here...
and 110amps when im pushen it but it still wants more
so i use a 750cca battery when i want full power.

for my custom Moded amps on
6 Main's
and a pair of Shocker 12" Apocalipse woofers
in a custom folded horn enclosure.

http://img80.imageshack.us/img80/418...cker268yd3.jpg

http://www.frontiernet.net/~radioman193193/Left.JPG

I miss my Sound off's / IASCA and IdBl

Nice fan

it was before i got the ac in back here and it was over 100 that day and only went down to like 91 or 93 that nite.
so the old junk fan was the best way to keep things cool.
plus the amps dont dissipate heat well with the builtin fans mounted vertically on the wall like that.

but there happy now.

sweet setup!

Thanks ...

its part of my pirate radio station controle center for
88.9 Thunderground radio.
http://www.frontiernet.net/~radioman.../my%20logo.JPG

500Watt stereo @ 88.9 Fm.
Real Radio no web streams.
its Been on the air for 7 years now

i got all new 22" Monitors and well ill just say its been All upgraded from when these pictures were taken.........

http://www.frontiernet.net/~radioman193193/Leftside.JPG

http://www.frontiernet.net/~radioman193193/center.jpg

http://www.frontiernet.net/~radioman193193/right.JPG

very nice setup man

Tonight when I was charging my 6s 30ah pack, my Hyperion EOS0610i charger failed while running off of the HP power supply in the OP of this thread. I doubt it was the PS's fault, but I thought I would post it here just in case. I was kind-of pushing the charger, but it hasn't failed after months of use until now. Also, I have lost a power supply charging this pack too; maybe my main is the culprit..

To fix this problem I just bought two more power 575w power supplies for $26. I'll mount two on some plywood and wire em up for 24v to run a new charger... Maybe a 1000w charger to charge my 6s 30ah pack?? :smile:

hi there,
I am trying to get an other power supply, and have found an p/s "750W p/s ASR2500PS Intel Modul for SR2500". it supplies 62 amps (!!), I just wonder where to connect what... it looks a bit different than the HP serverer power supplies.
http://i52.tinypic.com/14slegg.jpg

I have three chargers (average stuff) on one pc 500w p/s and sometimes it seems not to be sufficient.

otherwise I am going to get a 800w PC p/s, it may be a bit easier for me, 'cos I have already converted one. this server stuff is new to me...:neutral:
edit:
this one might be an alternative:
http://i54.tinypic.com/2czybh2.jpg

many thanks
florian

That 750w supply is only good for 20A on the 12v rail. However, from online documentation, it also has a -12v rail rated for 20A as well. If true, you could get 24v @ 20A from that...

I would be surprised if that works. More than likely, both supplies share a common ground, and when you hook them in series, you will short out the output on one of them.

hm, on the sticker it says:
http://i55.tinypic.com/se0mj4.jpg

what do you mean, is it possible to "add" voltage?

Well, that's weird. I did a quick search and the stickers I saw didn't say that. It should work fine then.

If you have a positive and negative supply rated for the same current, you can hook up your load across the two; load+ to supply+ and load ground to supply-. You see that all the time with regular power transformers: you'll have your main outputs, but then also a center tap. If you use the center tap you get a + and - supply. But if you just use the main outputs (not center tap), you get the full voltage. RadioShacks transformers are like this. Like their 12v models; they're rated 12.6v, but if you use the center tap you get +6.3v and -6.3v.

I saw earlier in this thread something about it...

Here's good how-to on converting two 12v power supplies to one 24v power supply - http://www.rcgroups.com/forums/showthread.php?t=1164359

I picked one of these up for $25 shipped and it came in today. And of course I opened it up as soon as I got home. Bad news is that there is no adjustment pot inside; I even looked under the heatsinks. The good news is that I was able to boost the output to 12.95v. Not much, but still some.

All I did was create a voltage divider consisting of a 220 ohm resistor and a diode. Tied the + output to the resistor, the other end of the resistor to the anode of the diode, and the cathode of the diode to the - output. I then tied a wire from the diode/resistor connection to pin 5, which feeds ~0.7v to pin 5. Looks like pin 5 is not a ground, but a feedback line to boost the output if there is voltage drop due to heavy current. This resistor/diode trick just tricks the PS into thinking it needs to output higher voltage.

Good stuff Brian.

I decided I would go about building a 24v power supply. There's a guide on hooking up two power supplies in series here.

I got my power supplies from ebay yesterday and wired em up today. Now I have a 24v 1150w power supply that I paid $26 for. :smile:

The final unit is 13x7" and the output measures 25.2v. If I put the leads of my multimeter on each power supply, I get 12v between the two. I haven't touched it yet, and I don't know if it will shock me if I touch it.

I cut some pegboard to mount the power supplies on.
http://i345.photobucket.com/albums/p...1/IMG_0269.jpg

Testing - The power supply on the right is wrapped in clear packaging tape.
http://i345.photobucket.com/albums/p...1/IMG_0272.jpg

I mounted the power supplies to the pegboard with some bolts, M3 I believe. I then used some unshrunk heat shrink (1" wide) and duct tape to try to insulate the screws.
http://i345.photobucket.com/albums/p...1/IMG_0274.jpg

And my awesome duct tape job.
http://i345.photobucket.com/albums/p...1/IMG_0275.jpg

25.2v output under no load.
http://i345.photobucket.com/albums/p...1/IMG_0277.jpg

That is some serious power supply you got there mang. I'm now thinking to do the same, but with both 12V and 24V capability. Good Job!

Thanks! When hooking the power supplies up in parallel is it the same procedure as when hooking them up in series? Just change the output leads?

And I just realized you save about $200 in making one of these power supplies!

Little update on boosting the output for those interested. I ended up using a couple of resistors to make the voltage divider instead of a diode; a 210 ohm and 20 ohm. This gets me ~13.2v. I was able to get to 13.6v, but the supply sometimes wouldn't turn on or stay on. 13.5v worked fine, but I brought it down to 13.2v just for a little extra wiggle room.


First, the stock power daughter board. There is a blue and purple wire which I cut. One is a 5v line, the other is a -12v line.
http://scriptasylum.com/forumpics/ps47_a.jpg


Then, I cut away where the 5v and -12v lines were to make room to run the wires for the voltage booster resistors. I soldered pins 6 and 10 directly to ground to turn the PS on. Even when these aren't connected, the PS is on somewhat so I figured I'd just hardwire them and use the mains plug as a power switch. I then soldered wires to a ground point, +12v point, and to pin 5 (v adjust pin).
http://scriptasylum.com/forumpics/ps47_b.jpg


On the other side of the daughter board, I attached those three wires to the resistors and hotglued the resistor pack to the PCB. I did have to remove the bolt lug from the case so the resistors would fit.
http://scriptasylum.com/forumpics/ps47_c.jpg


Here is a simple schematic to show how to arrange the resistors. The power ratings of the resistors, especially the 210 ohm one, should be 2w or more.
http://scriptasylum.com/forumpics/ps47_d.jpg


As you can see, I soldered the binding posts directly to the blade plugs. The soldering job is good, it just looks crappy because as I soldered one side, it would drip down. Since the pins themselves weren't being used, I ground them all down.

Here is another pic showing what I know of the pins:
http://scriptasylum.com/forumpics/ps47_e.jpg

Wow there Brian. You like to eek out every little bit of power out of that PSU heh?!

lol, why not? Gotta make the most out of $25! :smile:

hi there,

after I converted an other pc p/s last weekend (quite easy), I have now two p/s for my chargers, which is good.

finally I got one of those, but wonder if anyone knows about them, I got one of them for 2,5 euro...
http://s7.directupload.net/images/101018/hhkg4irb.jpg
http://s3.directupload.net/images/101018/rzeb5mwh.jpg

with a maximum of 75 amps on 12v I will be safe for the next years.

thanks
florian

Those look badass!!
930W / 75.7A ... watch out LiPo's :D

Have you searched on RC Tech? They have several of these server PSU conversion threads.

thanks for that hint, I'll have a look :smile:

got them on egay, used, private seller, I hope they will work...

This is a good thread. I am glad to see that I'm not the only fool out there looking for some true clean dirt power source for a charger.

At some point it gets a bit overkill to have such a large 12v supply unless you have multiple chargers to power at the same time. Many (if not all) chargers over 300w require a supply with higher voltage (like 24v) to be able to use it to its max output. Just a little food for thought.

that's the story:
I have three (2 weak, 1 strong) charger, and want to be on the safe side, even on the long run. soon I get a second strong charger with about 180watts to charge all six 5s (4000-5000mah) lipos quickly. I store my batteries low-medium charged, so when I decide on a saturday morning to go for some fun, they need to be charged in short time.

It can deliver a maximum of 75a, that doesn't mean that it has to do that all the time. with the allied p/s (500w) I have experienced that when all three chargers run on that one p/s, one charger gets problems. actually the p/s should be sufficient, but obviously it's not, even that it's a brand p/s. the other p/s (brand stuff) I have converted recently is about the same, it says 550w, but actually can handle solely the 150w charger.

overall, the p/s worked great for me. The only problem is, when it says 500w, it's all together, on all lines, but not on the 12v line (maybe 300w?).

like that, I've decided to get a big one, so I never have to worry any more.

Yeah, normal PS units power ratings are all rails combined. These server supplies are just 12v, which makes it nice for us.

I know you don't "need" 75A (and it does place less stress on the supply if used under that value), I just wanted to make the point (mainly for others) that just because it is capable of near 1000w doesn't mean that some of the higher output chargers will be able to utilize it unless the voltage is higher.

Question...
 

I have a few old desk tops in storage that are not going to be used again. How can I convert one of those into a dependable PS for my charger? Thanks.

http://www.rc-monster.com/forum/showthread.php?t=3962

Whether those PS units will work or not depends on how much current is available on the 12v line. The power rating is for the 12v, 3.3v, and 5v rails combined, so the 12v rail by itself will be somewhat lower. There should be a label on the case somewhere that states the current for each rail.