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Old 17th September 2003, 12:22 PM   #1
esl is offline esl  Poland
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Default MAT 02/03 amplifier schmetic needed

Hello!
Few days ago I started to thing about building integrated
amplifiers to drive my esl speakers. So I started to look
for some transistors in my drawers and it turned out that
I have some MAT02/03.

So there are the questions:
- as far as I can remember, Elektor used to apply these
in their "hi-end" amplifier, which actually also sported
2SA1216/2SC2922 for the power stage. Can anyone comment
on this schematic?
link is here: http://www.mif.pg.gda.pl/homepages/tom/files/200W.gif
To be honest, I feel that there's much room for improvement
in case of this schematic, changing 2SA1269/2SC2922 to
2SC5200/2SA1943 to say at least.
- does anyone have a copy of Elektor's "hi end preamplifier"
schamtics? (or any other schamtics that sports MAT02/03).

Thanks,

esl
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Old 17th September 2003, 02:34 PM   #2
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Default Re: MAT 02/03 amplifier schmetic needed

Quote:
Originally posted by esl
Hello!
Few days ago I started to thing about building integrated
amplifiers to drive my esl speakers. So I started to look
for some transistors in my drawers and it turned out that
I have some MAT02/03.

So there are the questions:
- as far as I can remember, Elektor used to apply these
in their "hi-end" amplifier, which actually also sported
2SA1216/2SC2922 for the power stage. Can anyone comment
on this schematic?
link is here: http://www.mif.pg.gda.pl/homepages/tom/files/200W.gif
To be honest, I feel that there's much room for improvement
in case of this schematic, changing 2SA1269/2SC2922 to
2SC5200/2SA1943 to say at least.
- does anyone have a copy of Elektor's "hi end preamplifier"
schamtics? (or any other schamtics that sports MAT02/03).
Any preamp having an LTP at the input can be modified to use MAT02/03.

On power amps the problem is the high voltages which the MATs can't take, particularly as on most power amps it's better to use higher voltages on the first stages. You see that Elektor had to put zeners on the collectors to solve that problem, and I don't think it's a good idea for our precious signal to go through them.

In this case it would be much better, sonically speaking, to put a cascode or a current mirror to handle the voltage, all other things remaining the same. Opinions on this matter would also be appreciated.

The rest of the circuit looks fine, as it has no cap on the feedback and a DC offset trimming at the input. The relay control at the output seems a bit confusing though.


Carlos
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Old 17th September 2003, 02:52 PM   #3
sajti is offline sajti  Hungary
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Mark Levinson use them in No. 20,5, and 23,5 amplifiers.

Sajti
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Old 17th September 2003, 03:08 PM   #4
esl is offline esl  Poland
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Can anyone provide me with an alternative schematic for pre or
power that sports MAT 02/03 ?

esl
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Old 17th September 2003, 09:33 PM   #5
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Default Pre Amp

Hi esl,

What kind of ESL's do you have?

Here's a preamp (Elektor).
Can't find the MAT-02/03 pre.

Regards,

Audiofanatic
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File Type: jpg elektuur preamp.jpg (92.1 KB, 1834 views)
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Old 17th September 2003, 10:51 PM   #6
Vigier is offline Vigier  Netherlands
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Hi,

looking for this one?
Short specs (from memory) : 0.00025% THD @1V @1 kHz, 200V/µS, 9V max output voltage.

Grtz, Joris
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Old 18th September 2003, 10:01 AM   #7
esl is offline esl  Poland
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Audiofanatic:
thanst for the schematic. My esl'a are Martin Logan Scenario.
Hybrid speaker sporting 8" Rockford Fosgate woofer in a sealed
enclosure.
The problem with these speakers is the fact that they need
fair amount of power to sing, especially due to the fact that
their impedance above 10 KHz drops below 4 Ohms.
So, I think about buiding suitable integrated amp for them.
The schematic with 2SA1216/2SC2922 could be the one to go,
but - anyway - wouldn't it be better to use 2SC5200/2SA1943
and find any simpler schematics?

Vigier:
thanks, maybe this is the topology that I am gonna use.
Looks good, doesn't it?

esl
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Old 18th September 2003, 03:35 PM   #8
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Default Schematic

Yep!

Thanks thats the one!

I know that peramp and It sounds Tremendus!

Regards,

Audiofanatic
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Old 18th September 2003, 06:07 PM   #9
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Default MAT02 and MAT03

These parts are were made by PMI now Analog Devices

http://www.analog.com/Analog_Root/pr...AT02%2C00.html
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Old 18th September 2003, 06:23 PM   #10
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You don't have to have a specific MAT02/03 design. In most cases the MAT's will fit in a design with a discrete pair. Since the MAT's have a little larger capacitances some parts may need redesign (not much though).

Did I mention that I have a bunch of SSM2210 (=MAT02) and SSM2220 (=MAT03) for sale?
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