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Old 18th September 2003, 08:03 PM   #11
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Default LM394 eqiv for MAT02

http://www.ee.washington.edu/stores/...near/lm394.pdf

http://members.ozemail.com.au/~boobi...eets/mat02.pdf
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Old 19th September 2003, 06:11 AM   #12
BrianL is offline BrianL  United States
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If the power amp rails are too large for the MAT's, just use
a cascode. Then you can pick a reasonable voltage for
them.
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Old 19th September 2003, 06:20 AM   #13
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Default Re: LM394 eqiv for MAT02

Fred, LM394 is not = MAT02. LM394 has much more noise but for power amps this is not a big issue.
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Old 19th September 2003, 10:45 AM   #14
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Hello!
Thanks for your support, I'll probably go with the schematics provided by Vigier, but still have to rething driver and power
stage topology.
As I mentioned before - I am out to get some 2SC5200/2SA1943,
probably four pairs to work in the power stage. Does anyone
is in possesion of shematics sporting these Toshiba transistors?
What driver would be suitable for them, and in which topolgy...

As for MAT's, I have 4 of them at the moment

Thanks,

esl
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Old 21st September 2003, 03:07 PM   #15
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"Fred, LM394 is not = MAT02. LM394 has much more noise but for power amps this is not a big issue."

Would you like MAT02 >= LM324

The first page of the MAT-02 calls it an
"Improved direct replacement for LM394"

Noise is around 1 nV Per squareroot root Hz. when both are measured at the same collector current of 1 mA. This low level of Noise is not and issue for a power amp is probably over an order of maginitude better than needed. The low volgage handling and larger capacitance might make it a poor choice for this application though. Pehaps a good lookat the data sheets before posting might be a good idea in cases like these. I usually try to do that when comparing numbers.


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

No.... and you should not unless it it is on the trading post thread.

I thought this I was your feeling too:
http://www.diyaudio.com/forums/showt...020#post138020

You already have a link to your website with every post you make. If this was an isolated "by the way type" mention it would be one thing, but you have used this forum to attract buyers to your website on several occasions. It gives every appearance that you are exploiting the forum for the chance to sell something. I don't believe I am the only one that has a problem with this. I don't come here to sell things or to have other people sell things to me. i would like the advice to be free of commercial motives. The are enough challenges to the credibility of many statements without accusations of commercialism becoming yet another tpoic for argument. This is why other forum websites have manufacturer's forums to avoid this sort of blurring of the lines. Please stop it. Your URL is easily accessible and thechance to link in the signature is already incredible generosity from Jason. I would fear the abuse of that privilege might remove that opportunity being available. Why do you have push the very boundaries of what is allowed to sell stuff? Is that all the community on the forum is to you is potential customers? If so let us know so we can stop offering you free advice for you to turn around and make money with on the same forum. It has really become obnoxious. If others feel different post away and we can move the thread.

Fred
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Old 21st September 2003, 06:28 PM   #16
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The silly part of all this, is that you folks CAN'T read a data sheet. There are differences between the MAT02 and the LM394, BUT it is not noise. Also, if any of you actually bother to read these data sheets, please NOTE the very high capacitance shown in the Ccb and Cbe graphs. This is as bad or worse than that of an equivalent noise FET, like the 2SK389.
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Old 21st September 2003, 08:05 PM   #17
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I read the data sheet.......

"The first page of the MAT-02 calls it an
"Improved direct replacement for LM394"

The low volgage (votage if I could type) handling and larger capacitance might make it a poor choice for this application though"

Will agree that it is not an exact second source but was designed to compete with the LM394 for designs by people who read all the data sheets and measure differences in the actual circuit.

I do find my self in contention with the silliness remark. There many more silly parts in the thread and not reading the data sheet is just one of them.

Thanks Mr. Curl,

Fred


PS Does't Bolder use this device in the front end of thre pre and power amps?
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Old 21st September 2003, 08:17 PM   #18
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Quote:
Originally posted by Fred Dieckmann
[snip]"The first page of the MAT-02 calls it an
"Improved direct replacement for LM394"
[snip]Fred

PS Does't Bolder use this device in the front end of thre pre and power amps?
Fred,

Very often a manufacturer picks a single parameter on which their product is better, and then post the " improved replacement of..." statement. Except for this specific parameter, all the others may actually be (much) worse. I did NOT read this particular data sheet, but if I read such I statement I immediately become VERY suspicious. FWIW.

Jan Didden
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Old 21st September 2003, 08:35 PM   #19
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Folks, I am just wanting to wake you up to what is in front of you. Both data sheets were listed on this thread. Both data sheets are complete, as far as they go. Neither device is 'better' than the other, for audio, yet a 2SK389 will beat both for low noise over a range of inputs.
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Old 21st September 2003, 09:21 PM   #20
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Quote:
Originally posted by john curl
Folks, I am just wanting to wake you up to what is in front of you. Both data sheets were listed on this thread. Both data sheets are complete, as far as they go. Neither device is 'better' than the other, for audio, yet a 2SK389 will beat both for low noise over a range of inputs.
John,
Sonically I prefer the 2SK389 over the MAT02.
I doubt this has anything to do with noise.
Both devices have to be cascoded in order not to sound dull to my ears....
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