48 VDC/10 A power supply looking for an Amp design

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A

Analog Addict

Member
2007-04-15 4:55 pm
Greeting All!

Migrated over here from AK to see if someone might point me in the right direction to find an amplifier design to fit a power supply I recently bought....

here's the Beef...:D

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


I'm basically looking to try and build an amp to power the low end of a set of Infinity RSIIb's, which can drop to 1 ohm impedance during use. I have a Nak PA-5A II Stasis amp/Hafler DH-500 for the high end. As I understand it, this power supply is good for almost 500 Watts, but I'm really more interested in trading power for higher quality sound. I also have a friend who may be able to lend a hand, including making the PCB's etc....


Thanks!
 
taj

taj

diyAudio Member
2005-02-23 8:49 pm
There are plenty of amplifier designs available here that work fine at 48 volts (assuming your supply is bipolar). But to drive a 1-ohm load it's going to require a lot of parallel output transistors (5 pairs?) to handle the current draw.

Is that 48v secondary AC or rectified DC?

Maybe the Delta Audio Leach amp (5 pair version). http://www.delta-audio.com/Leach-Clone.htm

FYI: I can't view your links as I'm not a member of that forum.

..Todd
 
megajocke

megajocke

Member
2003-01-11 8:01 pm
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Stuart Easson

Stuart Easson

Member
2002-10-18 6:31 pm
Santa Cruz, CA
I don't think...

...it's a bipolar design.

There are plenty of amps that can run from a single ended supply, but the Leach mentioned so far is not among them...

You can 'fake' a bipolar supply using a pair of huge caps and some bleeder resisters etc, but you would have a +/- ~24v supply. Not really a huge limitation if driving 1ohm speakers is your goal, but something to keep in mind.

Using a pair of bridged amps might be possible, since the outputs are then relative to each other, not ground, but AC or balanced input would then also be needed...AlephX springs to mind, or a pair of KSA50s.

HTH

Stuart
 
ekaerin

ekaerin

Member
2004-06-07 9:36 am
Stockholm
Hi,

Guess that supply will work just fine. It's quite large though.
Any single supply amp will work. (Do I dare mention FB-D-Amp).

-48V linear supply, sounds like some ancient telecom supply, in that case the output is likely to be slightly above 50V at lower loads and the output ripple and noise is very low.
Considering the size of the caps the above might be true.

/ Mattias
 
Nico Ras

Nico Ras

Member
2005-11-12 9:09 pm
Durban or as it is now called eThekwini
Simple workable example.
 

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jaycee

jaycee

Member
2004-04-13 12:31 am
Norwich, UK
It might be worth examining the secondary of the transformer in this power supply, and seeing if it only has the one output winding, or two in parallel. If it has two in parallel, you could get 48V bipolar supply - at 5A per rail. As there are two capacitors (presumably in parallel) you could use those too.
 
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