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Old 31st August 2003, 01:16 PM   #1
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Default How do I match bipolar transistors like MJ15003 ?

May be this is a silly question, but forgive me, as I am a tube guy: How do I match bipolar transistors like the MJ15003 (for building the JLH)?

Thanks
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Old 31st August 2003, 01:29 PM   #2
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Start by looking at this thread:

transistor matching
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Old 31st August 2003, 02:14 PM   #3
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Default THX, but

..this threat is only talking about how difficult it is to match, not really what the practical setup is and how you come to a result. Mosfet-matching I learned by the Aleph-X-threat, but bipolars ?
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Old 31st August 2003, 04:18 PM   #4
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Default you will need this many:

get a couple hundred:
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File Type: jpg mj15003.jpg (91.6 KB, 935 views)
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Old 31st August 2003, 05:17 PM   #5
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Great ! Do you have 2 matched pairs you can offer ?

Best Regards
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Old 31st August 2003, 05:22 PM   #6
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Such pictures can make you go bananas
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Old 31st August 2003, 06:10 PM   #7
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Default I love Bananas!

Olala!

Nice pics! You can build lots of amps from that, yes? Wish I was your neighbor!

JojoD
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Old 31st August 2003, 10:18 PM   #8
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What matching is needed?

Unless you feel the need to raise the B+ and parallel more outputs in the search for higher power no matching is needed.

Even if you did feel the need for the above, normal emitter resistors in the range of 0R22 would force current sharing.
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Old 1st September 2003, 03:20 AM   #9
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Theres some info here that could get you started
http://sound.westhost.com/transistor-matching.htm
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Old 1st September 2003, 10:24 AM   #10
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Get them from me,

I've still got some matched pairs MJ15003 left from a tray similar as the picture in this thread.

They are matched for as close as possible hfe at Ic of 0.6 A and 0.9 A.
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