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Old 15th October 2004, 11:05 PM   #1
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Default Best Transistor?

im trying to design/build an amplifier from the scratch can someone tellme the "best" transistors to use?

i mean some nice transistor to made an high end AMP.


hope someone understand my question

2SA1216 and 2SC2922 are ok, thats are the transistors that have my yamaha amp. but its not high end (i think)
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Old 15th October 2004, 11:15 PM   #2
mikeks is offline mikeks  United Kingdom
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Input and second stage: ZTX1056A/ZTX796A

Driver Stage: KSA1220/KSC2690

Output Stage: MJL1302A/MJL3281A
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Old 15th October 2004, 11:22 PM   #3
mikeks is offline mikeks  United Kingdom
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..........respectively from zetex, fairchild, and onsemi...
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Old 15th October 2004, 11:31 PM   #4
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thanks ill see the datasheets
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Old 17th October 2004, 03:16 AM   #5
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Quote:
Originally posted by mikeks
Output Stage: MJL1302A/MJL3281A

Have you tried the newer MJL4281A/MJL4302A? I'm going to be building an amp with them soon.
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Old 17th October 2004, 03:44 AM   #6
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no, i never build an amplifier im trying to understand how it work....

im trying to understand abt transistor biasing(whitout luck)
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Old 17th October 2004, 12:25 PM   #7
djk is offline djk
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If you are building a smaller amp with only one pair of outputs, the MJ21193/94 are better than the other types mentioned.

The speed on the others drops like a rock at high current.

If you're driving 200W/8R with four pair of the others, there is only 1.75A (peak) per device and they are OK.

If you're doing 100W/4R with one pair (in an ESP 3A for instance) you are running 7A (peak) per device, use the MJ21193/94.

Even for high voltage I still prefer the MJ211XX series, they have twice the safe area in the 80V~100V region, and twice the Delta T at typical junction temperatures, so I only need one steel cased TO3 instead of three plastic devices.
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Old 17th October 2004, 02:36 PM   #8
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well i dont want so much Watts, i just want an nice High End amp, with 100W will be ok, because my room is just 6m x 4m (24 m^2)

i think that to start will be ok to understand how it work, and start with an simple conf, with just one pair of transistors, and maybe later try others.
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Old 17th October 2004, 05:14 PM   #9
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Hi Samsagaz!

It is a brave idea to design your own high end amp from scratch.
You will not only need the right transistors.... also not only the right
passive components....
It's also a lot about the right topology. And if you have decided about the basic topology and components then still your choice of the component's values can turn the sound to any direction....
...further: Layout, PSU, thermal design....

But I can understand you very well. DIY from scratch is
the real challenge.
...started to play around 20 years back.... , but
did not manage to combine my demands regarding ruggedness
and power with real high end....
Well and then I was inactive about for about ten years and
now sometimes feeling like a school boy since I entered this
forum last winter....

What I want to say:
It will become harder than you expect. But it is worth it!
Never give up!

My hint:
Before you start your design, first try to listen to amps with
different topologies.
So you may find the basic direction, which matches best to your ears.


Cheers
Markus
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Old 17th October 2004, 06:27 PM   #10
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thanks dude
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