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Old 2nd January 2007, 01:49 PM   #1
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Default how to match devices -help-

I'm searching on the forum how to match transistor-jfet-mosfet.

I would like to know...if it is possible do it on your own.
If so, is there any circuit test that i can build and that work fine for the purpose?


hope to receive ...as everytime...your good advice!

best regards,
Stefano.
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Old 2nd January 2007, 02:50 PM   #2
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which FETS are you trying to match?

is there a particular amp you are going to build?

Check out www.passdiy.com and under the Articles section there is a paper on matching FETS.
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Old 2nd January 2007, 03:08 PM   #3
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well actually i have to repair my electrocompaniet ECI-4 and i have to replace the transistor (driver and output stage).
Since the configuration is in differential i would like to replace...since i'm have to....with complementary matched type.

The devices that i have to match are BJT (motorola MJL3281A and 1302A and Toshiba 2sa1350y and 2sc3421y).....which i still have to find somewhere...and i hope somebody could help me.

I also found them on the phoenix-components.com...but they since to supply only the industries.
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Old 2nd January 2007, 03:33 PM   #4
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ciao, parliamo in italiano! basta che gli mandi una corrente fissa e calcoli la differenza di potenziale con il mos collegato a diodo,
puoi usare un lm317 in modalita sorgente di corrente e fare le misurazioni, mandagli 500ma o pił!
per fare questo devi dissipare il317 e il mos, se vuoi altro fammi sapere a x84andrea@libero.it
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Old 2nd January 2007, 03:33 PM   #5
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If you're talking about basic VGS matching, I saw suggestions in Nelson's DIY op amp article. I have a drawing if you want it.
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Old 2nd January 2007, 03:51 PM   #6
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Since they're bipolars, Vgs isn't applicable, unfortunately. That's for FETs. The equivalent measurement for bipolars--Vbe--is quite consistent.
What parameter needs to be matched? Beta? If so, to what spec?

Grey
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Old 2nd January 2007, 05:15 PM   #7
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Quote:
I'm searching on the forum how to match transistor-jfet-mosfet.
I guess this kind of threw me.

DIY op amps also shows how to match bipolars.
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Old 3rd January 2007, 06:39 AM   #8
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thanks guys for the posts.
I would like to have a little circuit test for matching Bipolar Transistor (mostly) and also have a circuit ...that i guess it's different... for MOS and FET.

I mean.....what do the companies use for selecting their componens? does anybody know it?
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