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Old 20th October 2007, 10:35 PM   #1
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Default is it necessary to match 2sj162&2sk1058

hi everybody..i was looking for 2sj162and 2sk1058 transistors for a long time in my country..and at the end i found them..i measured the gate-drain voltage of them..it is 0.57v and the other one is 0.63 v ..now some people say it is not necessary to match these lateral mosfets..what do you think about them?should i match them?i want to make a class a amp..i need to make a good pcb for it..it is very difficult to make a class a amp..every component have to be matched..so what do you think everyone?should i match 2sj and 2sk?
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Old 20th October 2007, 10:41 PM   #2
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Default Re: is it necessary to match 2sj162&2sk1058

Quote:
Originally posted by umut1001
hi everybody..i was looking for 2sj162and 2sk1058 transistors for a long time in my country..and at the end i found them..i measured the gate-drain voltage of them..it is 0.57v and the other one is 0.63 v ..now some people say it is not necessary to match these lateral mosfets..what do you think about them?should i match them?i want to make a class a amp..i need to make a good pcb for it..it is very difficult to make a class a amp..every component have to be matched..so what do you think everyone?should i match 2sj and 2sk?

depends .......

show us schematic and than we can tell you for sure .......

in any case - if you match them,you'll have better symmetry ;
in case that you must use multiple pairs , matching is necessary
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Old 20th October 2007, 10:49 PM   #3
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Default schematic

for example this circuit..

and i need a good class a pcb..i am working and i have not much time to draw it..would you send me a class a pcb ..will work at + -35 volts?
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Old 20th October 2007, 10:56 PM   #4
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Default Re: schematic

Quote:
Originally posted by umut1001
for example this circuit..

and i need a good class a pcb..i am working and i have not much time to draw it..would you send me a class a pcb ..will work at + -35 volts?

ya nutz ?



that's my circ - in fact my friend Oly made this little schematic .
you didn't follow exact thread where this is posted ; somewhere in start of Babelfish J thread

it's intended for IRF150 (or IRFP150 , whatever ) and his cousin IRF(P)9150 ; matching isn't so crucial there .
you can use 2SJ and 2SK with slight recalculation of drain resistors of Q1 and Q2 .

and - it isn't too wise to make it with more than 2x 25V

I have somewhere graphical files for that pcb ...... is that what you need ?

EDIT:

now I remember that Turks slaved Serbs for 600 yrs........ I will not help you with this .........

hehe, just joking,off course
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Old 20th October 2007, 11:02 PM   #5
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Default schematic

yes i need a schematic and pcb..my friend made a class a amplifier works at+-24 volts..it is working with irf540 and 9540..but the current was not stable enough..i will use 2sj162 and 2sk1058..if you send me schematics and pcb i will be happy thank you very much
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Old 20th October 2007, 11:10 PM   #6
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Default Re: schematic

Quote:
Originally posted by umut1001
yes i need a schematic and pcb..my friend made a class a amplifier works at+-24 volts..it is working with irf540 and 9540..but the current was not stable enough..i will use 2sj162 and 2sk1058..if you send me schematics and pcb i will be happy thank you very much

well - for stability you need to place input jfets in tight position , same as on this pic:
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Old 20th October 2007, 11:11 PM   #7
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that's last , tested schematic
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Old 20th October 2007, 11:13 PM   #8
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Default post me pcb pls

yes i know it..my friend is tieing transistors like this..dont you have a pcb that works in Ares ?
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Old 20th October 2007, 11:14 PM   #9
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and that's what I have regarding pcb ;
now you need just little work in some graphic progie .......
dunno is it scaled.......
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Old 20th October 2007, 11:18 PM   #10
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thank you is it working well? which transistors are being used for Q3 andQ4..can i use 2sj162 for it by changing the bias?
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