Power supply unit question

[Ilianh]

What about using a smps as a power supply for an aleph amp?










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Ever wanted to say "computer, stop the program" and to see youre onboard Enterprise in the holodeck?

[Nelson Pass]

Go ahead. Make the current capacity about 3 times
the bias value per channel.

[eLarson]

I'm interested in trying this out, too, but haven't the
foggiest where to purchase a unit that isn't +/-5
and +12 output. (Most of my searches have
turned up supplies intended for PC motherboards.)

Any suggestions on what terns to search for to get
a unit that will provide +/-24 or +/- 48 volt ouputs
at several amps?

Erik

[joensd]

It was done in the Linn Klimax Twin.
Anybody heard of this amplifier or even tried?
I always wondered why this cost 10000€.
It´s SMPS supply and 6*TDA7294 for quite a bit of stereo power.
Anybody got a schematic for that one?. (just for interest)

It´s an interesting topic to "skip" the big transformer you usually need for audio applications but building a good and reliable SMPS supply will probably turn out to be more complicate than the amp itself !?

[Ilianh]

thanks for the replies

well, yhea, thats a major point, in a small box about as big as a computer psu, you can have a like 700 watts power supply, and not evryone wants to buy an very expensive psu, or to wind one...
ive started a half bridge smps to power my computer system because i cant find a 17 amps +\- 35v psu, and even if i did find one, can you imagine the size of that :|

[kiwi_abroad]

eLarson,

Do a search for telecom power supply modules. Telephone exchanges run on 48-54v nominal, and cell phone exchanes run on 24-27v nominal.
I used to work for a company that produced these modules that output up to 120A with very low noise.

Adrian.

[Bakmeel]

Interesting subject indeed,

SMPS aren't easy to design for custom applications. The basic ideas however are simple.

But before you plunge yourself in the datasheets and wild dreams: Besides it being smaller and lighter, why would you want a SMPS? Think about the (expensive) HF transformer you would have to obtain, the HF distosion you introduce in you Power Rails, the heat they produce, and often horrendous stability they sometimes provide. (Computer PSU's are known for it).

Would they really provide that much advantages over that?

Bouke

[Ilianh]

yhea, thats what ive been asking myself for months.

But, can u simply imagine how big is a 17-20 amps psu at like from 35-50v +\- rails


yes, thats big....

and very heavy
for my pc system project, i need a 35 to 50v +/- at 15.5 amps psu
and thats not counting the amps loss... and evrything

so that makes a 17-20 amps psu at 35-50v, i just cant integrate such a psu in a woofer enclosure, unless its a smps,
any other suggestions?

[jleaman]

smps are loud and verry noisy and if you have a nice working aleph 1 2 4 5 6 what ever there numbers are and go upt to say you did get it working IT WOULD suck if the psu blew up because when they blow they blow every thing along the line. i work in a computer shop and see psus blowing all the time.. and i deal with lots of them issues. the only good amps that i know that use smps's are carver and qsc but you have to pay lots of money to have one. and if you have ever sseen a carver amp after it has blown up the smps's ones there garbage because they basicaly blow them selves up all the outputs and ect components. it would cost you to much to fix it PROPERLY.

jason

[jleaman]

SWEETTT.. you want to use one of these to power your amp.. yeahh!