ALEPH-XMM - The Mini-Monster

kristijan-k · 24th November 2003, 10:19 PM

Hello,

Here is the version of Aleph-XM amplifier, but in 'mini' version.

It is also an X, two-stage balanced single-ended amplifier, with
the DC feedback Zen on each output stage.

The total bias is slightly below 5 A, and the total heat dissipation is
around 175 W or 44 W ! per device, so the heatsinks should be rated
at 0,2 K/W as the real minimum.

Power output should be about 65 W / 8 Ohm, or around 45 W into 4 Ohm
load, with the specified parts and the power supply.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

dshortt9 · 25th November 2003, 05:44 AM

I like it. perhaps IRFP260's would be able to handle 44 watts easier. Lots of people want PCB's When do you estimate yours to be ready?

AudioFreak · 25th November 2003, 09:16 AM

A couple of IRFP044's would probably be absolutely perfect for this.

universum · 2nd January 2004, 04:00 PM

A couple of IRFP044's would probably be absolutely perfect for this.
What about a couple of IRFP054's?

Panelhead · 3rd January 2004, 12:18 AM

Any chance that mini - mini Aleph X may be available someday? A single transistor version with current source would be perfect for my needs.

George

Panelhead · 3rd January 2004, 03:41 AM

Quote:

Originally posted by Panelhead
Any chance that mini - mini Aleph X may be available someday? A single transistor version with current source would be perfect for my needs.

George

Looking into the circuit, it appears to me that four is the minimum number of transistors. Chnging the 0.27 ohm resistors to something like 0.54 should get the power consumption down to manageable levels for me.
Are boards going to be available for this?

jwb · 3rd January 2004, 03:58 AM

Am I being dense if I don't understand why this is "mini"? It seems to be capable of 80W into an 8Ω load, or 50W into 4Ω. My Aleph-X delivers 40W into 8 or 4Ω, and I don't consider it miniature! It's quite an effort!

loovet · 3rd January 2004, 10:29 AM

Hi Kristijan,

I’ve tried to simulate your schematic in CircuitMaker. But I don’t get the same result as you do.

In 8 ohm I get around 20 W and in 4 ohm I get around 40 W. Where am I wrong?

Shouldn’t I get it otherwise, more W in 8 ohm then in 4 ohm load.

By the way, I’ve changed the BC550C to ZXT450, I don’t think that would cause any problem, do you?

BR

/loovet

grataku · 5th January 2004, 06:12 AM

Look dude, I wasn't gonna say anything but ...this is no different from the Grey version so it ain't no mini, it's more like another kulata from kularjic.
Wanna build it? Buy a couple of boards from Chad and get to work.

24th November 2003, 10:19 PM	#1
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	ALEPH-XMM - The Mini-Monster Hello, Here is the version of Aleph-XM amplifier, but in 'mini' version. It is also an X, two-stage balanced single-ended amplifier, with the DC feedback Zen on each output stage. The total bias is slightly below 5 A, and the total heat dissipation is around 175 W or 44 W ! per device, so the heatsinks should be rated at 0,2 K/W as the real minimum. Power output should be about 65 W / 8 Ohm, or around 45 W into 4 Ohm load, with the specified parts and the power supply. Best regards, Kristijan Kljucaric http://web.vip.hr/pcb-design.vip

25th November 2003, 09:16 AM	#3
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	A couple of IRFP044's would probably be absolutely perfect for this. __________________ - Dan

3rd January 2004, 12:18 AM	#5
Panelhead diyAudio Member Join Date: Dec 2002 Location: Houston	Mini Aleph XM Any chance that mini - mini Aleph X may be available someday? A single transistor version with current source would be perfect for my needs. George

3rd January 2004, 10:29 AM	#8
loovet diyAudio Member Join Date: Sep 2002 Location: Outside Stockholm	Simulation Hi Kristijan, I’ve tried to simulate your schematic in CircuitMaker. But I don’t get the same result as you do. In 8 ohm I get around 20 W and in 4 ohm I get around 40 W. Where am I wrong? Shouldn’t I get it otherwise, more W in 8 ohm then in 4 ohm load. By the way, I’ve changed the BC550C to ZXT450, I don’t think that would cause any problem, do you? BR /loovet

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25th November 2003, 05:44 AM	#2
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	I like it. perhaps IRFP260's would be able to handle 44 watts easier. Lots of people want PCB's When do you estimate yours to be ready?

3rd January 2004, 03:58 AM	#7
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	Am I being dense if I don't understand why this is "mini"? It seems to be capable of 80W into an 8Ω load, or 50W into 4Ω. My Aleph-X delivers 40W into 8 or 4Ω, and I don't consider it miniature! It's quite an effort!

5th January 2004, 06:12 AM	#9
grataku diyAudio Member Join Date: Dec 2000 Location: -	Look dude, I wasn't gonna say anything but ...this is no different from the Grey version so it ain't no mini, it's more like another kulata from kularjic. Wanna build it? Buy a couple of boards from Chad and get to work.

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