Hi everybody, I'm looking for a 1.2-1.5kVA SMPS to power an AMP2 modded for high power according to Jan's guidelines. Any idea where I can find such a beast?
I've looked at coldamp...theirs isn't available yet. I've looked at digiamps.com...there's a possibility there, but I have some questions in to them on pricing. Hypex says they're working on one but don't intend to make it available to DIY community.
I've also looked at another company, whom I won't mention, since, it seems, the products they're selling are unauthorized copies of QSC's SMPS and PL and PLX amplifiers...so no-go there.
What about single-output SMPS's that I can connect in series...anyone had any good luck with that?
Any suggestions out there?
--Greg
PS--Failing that, where can I find affordable 1.5kVA 45-0-45 toroids in USA? (40V is OK, too)
I've looked at coldamp...theirs isn't available yet. I've looked at digiamps.com...there's a possibility there, but I have some questions in to them on pricing. Hypex says they're working on one but don't intend to make it available to DIY community.
I've also looked at another company, whom I won't mention, since, it seems, the products they're selling are unauthorized copies of QSC's SMPS and PL and PLX amplifiers...so no-go there.
What about single-output SMPS's that I can connect in series...anyone had any good luck with that?
Any suggestions out there?
--Greg
PS--Failing that, where can I find affordable 1.5kVA 45-0-45 toroids in USA? (40V is OK, too)
Just in case it helps...
In fact you will find two models of SMPS at www.coldamp.com: a bigger one rated at around 800W-1KW and a smaller one (still not advertised) with around 400W RMS capability and considerably smaller size.
They will be available in about two months at most. Sorry for the delay in launching them; we are receving a lot of interest in this supplies, and we already have several pre-production units running very well, we are just making sure that we have a very robust and tested product before making it available.
Best regards,
Sergio
In fact you will find two models of SMPS at www.coldamp.com: a bigger one rated at around 800W-1KW and a smaller one (still not advertised) with around 400W RMS capability and considerably smaller size.
They will be available in about two months at most. Sorry for the delay in launching them; we are receving a lot of interest in this supplies, and we already have several pre-production units running very well, we are just making sure that we have a very robust and tested product before making it available.
Best regards,
Sergio
ssanmor said:
that supply sure looks interesting.. Does it have power factor correction? Any price indication?
Gertjan
Thanks for your interest, but for commercial info please contact us directly.
These SMPS models don't have PFC. For this power range it provides little advantage, you probably won't see a PSU for audio with PFC under 1.5KW or so.
These SMPS models don't have PFC. For this power range it provides little advantage, you probably won't see a PSU for audio with PFC under 1.5KW or so.
Mmmm, bulky, isn't it?
They don't publish the dimensions, but it seems something like 230x200x55mm. And 3 lbs=1.5Kg aprox.
Besides, it is not what I call cheap: 329$ and you still have to assemble and test it!
I recall that Ghemink did quite a good bunch of tests with it. Perhaps he can tell us about his experience with that SMPS.
They don't publish the dimensions, but it seems something like 230x200x55mm. And 3 lbs=1.5Kg aprox.
Besides, it is not what I call cheap: 329$ and you still have to assemble and test it!
I recall that Ghemink did quite a good bunch of tests with it. Perhaps he can tell us about his experience with that SMPS.
or here:
http://www.alab-pro.com/index.php?lay=show&ac=article&Id=172728&Ntype=6
For price click "order now" button.
http://www.alab-pro.com/index.php?lay=show&ac=article&Id=172728&Ntype=6
For price click "order now" button.
lenz said:
Yes...that's the "other company" I mentioned initally.
http://www.qscaudio.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=8;t=000017
http://www.diyaudio.com/forums/showthread.php?postid=799816#post799816
Their prices look great, but I won't do business with them.
I don't think the coldamp modules will work for me. 1kVA is not the right match for 2x500W amplifier.
Thanks for all the suggestions...please keep them coming.
--Greg
ssanmor said:
Sergio--
Unfortunately, there is no technical or pricing information on your website for either model. How am I to evaluate whether this is suitable for my application?
Based on what you say, I don't believe it is, since my project is intented to be 2x500W
Thank you, though for the input.
--Greg
Don't forget our good buddies at Cad audio:
http://www.digiamps.com/
And
http://www.cadaudio.dk/cadpwmmodules.htm
http://www.digiamps.com/
And
http://www.cadaudio.dk/cadpwmmodules.htm
Not wishing to toot my own trumpet
Since I have no product to 'sell'......
If you want to have a look at the website I'm setting up, genomerics.org , then you might get some ideas about a lot of the theory behind SMPS design and what might/should be possible.
Unfortunately this is an 'in my own sweet time' venture so if you wanted one quick then you are out of luck. It's also sort of 'purist' so if you're into low cost or 'fudging' the figures then it won't be what you're after.
I shall bite my tongue
But it's free information. I'm aiming 'low' with a two switch forward converter but the concepts are equally applicable at higher powers.
Cheers
DNA
Since I have no product to 'sell'......
If you want to have a look at the website I'm setting up, genomerics.org , then you might get some ideas about a lot of the theory behind SMPS design and what might/should be possible.
Unfortunately this is an 'in my own sweet time' venture so if you wanted one quick then you are out of luck. It's also sort of 'purist' so if you're into low cost or 'fudging' the figures then it won't be what you're after.
I shall bite my tongue
But it's free information. I'm aiming 'low' with a two switch forward converter but the concepts are equally applicable at higher powers.
Cheers
DNA
Have you or anyone else ever pondered just using a UcD as a buck regulator to regulate the rails?
Its a thought. Don't know if it can do 1.2kW, but assuming its audio its likely capable, like a UcD400 or 700.
Obvously, you'll need one per rail.
The topology seems to be tolerant of capacitance on the output, so use one as a regulator, with a much larger output cap.
Regards,
Mike
Its a thought. Don't know if it can do 1.2kW, but assuming its audio its likely capable, like a UcD400 or 700.
Obvously, you'll need one per rail.
The topology seems to be tolerant of capacitance on the output, so use one as a regulator, with a much larger output cap.
Regards,
Mike
Hi Greg.
If I were you I would get two Avel Lindberg toroidal transformers from Parts Express. The highest VA rating they have is 800VA, so you could get two of those. Just wire the secondaries of each transformer in parallel and use separate bridge rectifiers for each voltage rail. This will give you a very good linear unregulated supply assuming you use quality bridge rectifers and enough filtering capacitance. It'll run you $140 (not including shipping) for both transformers which is a good price compared to what some single 1600VA toroidal transformers cost.
http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&DID=7&CATID=29&ObjectGroup_ID=605
If I were you I would get two Avel Lindberg toroidal transformers from Parts Express. The highest VA rating they have is 800VA, so you could get two of those. Just wire the secondaries of each transformer in parallel and use separate bridge rectifiers for each voltage rail. This will give you a very good linear unregulated supply assuming you use quality bridge rectifers and enough filtering capacitance. It'll run you $140 (not including shipping) for both transformers which is a good price compared to what some single 1600VA toroidal transformers cost.
http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&DID=7&CATID=29&ObjectGroup_ID=605
Ouch - that'd be like 26lbs
SMPS would be like 2lbs.
So it depends on the application of the amp. SMPS for portability, and also probably better immunity to where you have to plug it in in portable situations . The SMPS does not cost that much more than the linear approach.
SMPS would be like 2lbs.
So it depends on the application of the amp. SMPS for portability, and also probably better immunity to where you have to plug it in in portable situations . The SMPS does not cost that much more than the linear approach.
Of course it would be heavier and take up much more space but it would be simpler and look cooler 😎 Plus you could always reuse the transformers for other projects down the road. It won't be as noisy either, but you will need some sort of soft start up circuitry to avoid tripping a circuit breaker with transformers that large.
Agreed - Toroids look cooler and chicks dig 'em .😀
That one Star Trek movie, where they saved the whales, had transparent aluminum. We should have this by now. We need transparent cases. We need to be able to show off the insides. Small implanted cameras don't give a wide enough angle.😀
That one Star Trek movie, where they saved the whales, had transparent aluminum. We should have this by now. We need transparent cases. We need to be able to show off the insides. Small implanted cameras don't give a wide enough angle.😀
Thanks for all the advice, folks...
I'd really like to stick with with SMPS for weight. This is for a DIY subwoofer amplifier (plate amp). Small sealed box, Linkwitz transform. 23lb. of toroid just doesn't seem practical in this application. For a rack- or shelf-mounted amp, I'd consider it.
If only commercial plate amps were 2-ohm capable or 2x4Ohm capable...
--Greg
I'd really like to stick with with SMPS for weight. This is for a DIY subwoofer amplifier (plate amp). Small sealed box, Linkwitz transform. 23lb. of toroid just doesn't seem practical in this application. For a rack- or shelf-mounted amp, I'd consider it.
If only commercial plate amps were 2-ohm capable or 2x4Ohm capable...
--Greg
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