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...😀
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!
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...😀
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!
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
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
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Lemme try this....
Here's a commercial link...
http://www.rselectronics.com/Catalog/ViewPart.aspx?Part=28-2233&MFG=SOL
Here's a commercial link...
http://www.rselectronics.com/Catalog/ViewPart.aspx?Part=28-2233&MFG=SOL
And a picture...(I hope)
An externally hosted image should be here but it was not working when we last tested it.
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
...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
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
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
3rd time the charm???
Some days it doesn't pay to get out of bed....
Some days it doesn't pay to get out of bed....
An externally hosted image should be here but it was not working when we last tested it.
Good guess...
The power supply came out of a lot of used telecom equipment, along with a couple of Kenwood PR70 -1 and 1A bench top regulated DC power supplies. 0-70 VDC up to 1A, and finely adjustable...
The power supply came out of a lot of used telecom equipment, along with a couple of Kenwood PR70 -1 and 1A bench top regulated DC power supplies. 0-70 VDC up to 1A, and finely adjustable...
Finally....
The moderators have finally gotten tired of looking at my boring posts!
Here's another....
The moderators have finally gotten tired of looking at my boring posts!
Here's another....
An externally hosted image should be here but it was not working when we last tested it.
and another...
An externally hosted image should be here but it was not working when we last tested it.
Last one I promise....
Thank you for bearing with me as I figure out the idiosyncrasies of this forum. ...
An externally hosted image should be here but it was not working when we last tested it.
Thank you for bearing with me as I figure out the idiosyncrasies of this forum. ...
Re: Last one I promise....
How low is the low end <100 Hz?
Analog Addict said:An externally hosted image should be here but it was not working when we last tested it.
Thank you for bearing with me as I figure out the idiosyncrasies of this forum. ...
How low is the low end <100 Hz?
If <100 Hz, there is no directivity regarding stereo. I would connect the two woofers is series and use two KSA50's biased for class AB and bridged.
....If you have the rackspace left.... the supply is an excellent mate as
an outboard PSU for a single supply, or as someone mentioned a bridged type, poweramp.
To bad you can't see the X-former when the unit gets thrown into the rack.
/ Mattias
an outboard PSU for a single supply, or as someone mentioned a bridged type, poweramp.
To bad you can't see the X-former when the unit gets thrown into the rack.
/ Mattias
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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