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Old 17th November 2001, 06:21 AM   #1
Vivek is offline Vivek  India
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Hi all,
Check out this amp at http://users.auth.gr/~mixos/projects...wampl_engl.htm
Do you think it is worth a try? And can I substitute the output pair with MJ2955, 2N3055.
Thanks for any help.
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Old 17th November 2001, 01:59 PM   #2
paulb is offline paulb  Canada
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A bit complicated for my taste. I'd suggest this (I'm in the process of building one):
http://sound.westhost.com/project3a.htm
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Old 17th November 2001, 05:12 PM   #3
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Vivek,

I agree with PaulB. Simpler, better.

Regards, P.Lacombe
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Old 17th November 2001, 05:19 PM   #4
paulb is offline paulb  Canada
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I forgot to mention that I amp I recommended can use 3055/2955 output transistors as well.
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Old 17th November 2001, 05:32 PM   #5
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"Complicated"?!

Wimps.

Still, the second design suggested appears to have a
Sziklai (complementary feedback) output stage, which is
a point in its favor. Either design is about as simple
as an amplifier built with bipolar transistors can get,
without being too simple and compromising performance.

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Old 18th November 2001, 03:50 AM   #6
walker is offline walker  Australia
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Just some quick thoughts.
Please realise that the layout of the tracks on the PCB can make or break even a good amps performance. Often, getting the schematic right is only half the problem.
The first amp has some ouput protection, the ESP amp only hase fuses. Some output protection circuits are blamed for nasty sounds.
Regards WALKER
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Old 18th November 2001, 07:41 AM   #7
AKSA is offline AKSA  Australia
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Damon,

Why is the Sziklai pair so good?

Elegant, yes. Linear, yes. But not easy to set up a stable bias point, and inclined to ultrasonic instability, particularly on the negative rail. The remedy is to throw it in manacles, which destroys the sound.

I have tested both Sziklai and Emitter follower output stages sonically, and can tell you the second type is easily the better.

Cheers,


Hugh
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Old 18th November 2001, 09:11 PM   #8
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I haven't actually built a working amplifier with
a Sziklai output stage, but intend to try and see
if it's as unstable as some claim.

Darlington-configured stages are definitely much
more popular.
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Old 21st November 2001, 05:46 AM   #9
Vivek is offline Vivek  India
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I think I will build Rod's amp. Besides getting the output transistors for the first amp was proving to be a problem. Thanks for all your suggestions.
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Old 26th November 2001, 07:11 PM   #10
palesha is offline palesha  India
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Default 100W

Why the output transistors not replacable by mosfet? How about replacing with IRF 540 & IRF 9540.
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