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-   -   MAT 02/03 amplifier schmetic needed (http://www.diyaudio.com/forums/solid-state/20393-mat-02-03-amplifier-schmetic-needed.html)

esl 17th September 2003 12:22 PM

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

carlmart 17th September 2003 02:34 PM

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

sajti 17th September 2003 02:52 PM

Mark Levinson use them in No. 20,5, and 23,5 amplifiers.

Sajti

esl 17th September 2003 03:08 PM

Can anyone provide me with an alternative schematic for pre or
power that sports MAT 02/03 ? ;)

esl

Audiofanatic 17th September 2003 09:33 PM

Pre Amp
 
2 Attachment(s)
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 ;)

Vigier 17th September 2003 10:51 PM

2 Attachment(s)
Hi,

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

Grtz, Joris

esl 18th September 2003 10:01 AM

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

Audiofanatic 18th September 2003 03:35 PM

Schematic
 
Yep!

Thanks thats the one!

I know that peramp and It sounds Tremendus!

Regards,

Audiofanatic ;)

jewilson 18th September 2003 06:07 PM

MAT02 and MAT03
 
These parts are were made by PMI now Analog Devices

http://www.analog.com/Analog_Root/pr...AT02%2C00.html

peranders 18th September 2003 06:23 PM

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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