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Old 15th January 2007, 08:36 AM   #1
Pigy is offline Pigy  Serbia
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Angry Matching of 2N3055 and emitors resistoers?

Please,forgive me for my bad english.
I'm from Serbia.
Healp me:
My problem is it:
How matching two pars transistors 2N3055 in audio amplifier.
I know this possible with matching transistors,their gain Hfe,but if gain is not homologous (seem) ,uses emitors resistors examp.0,1-0,47 oms.
It is true?
Which size of oms is ok for this.
Why is uses milioms resistors in emitor of transistors(output transistors)?
Please see my shematics and your comomment?
ps: T6,T7 is 2N3055,T4/T5 drivers BC286/287,R16,R17 0,47 oms.
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Old 15th January 2007, 10:33 AM   #2
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I this design I can't imagine that you'll need to match the output transistors.

Emitter resistors are usually in the range you describe and this for creating a voltage drop of 0.3 1.0 V. This voltage is used for controlling the working conditions of the transistor especially when it gets hot. If you don't have these resistors the transistor will draw more current -> hotter -> even more current -> even more hot -> more more -> -> -> -> -> ->
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Old 19th January 2007, 05:55 PM   #3
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For a test circuit to match dc current gain of transistors, look here:

http://users.ece.gatech.edu/~mleach/lowtim/part2.html
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Old 22nd January 2007, 08:37 AM   #4
Pigy is offline Pigy  Serbia
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Thanks friends,but who value of resisitors is possible for god job of transisitors.In many schematics value is 0.1-0.47 ohm.What's your suggestion?
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