100W amp

Vivek · 17th November 2001, 06:21 AM

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.

paulb · 17th November 2001, 01:59 PM

A bit complicated for my taste. I'd suggest this (I'm in the process of building one):
http://sound.westhost.com/project3a.htm

P.Lacombe · 17th November 2001, 05:12 PM

Vivek,

I agree with PaulB. Simpler, better.

Regards, P.Lacombe

paulb · 17th November 2001, 05:19 PM

I forgot to mention that I amp I recommended can use 3055/2955 output transistors as well.

Damon Hill · 17th November 2001, 05:32 PM

"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.

walker · 18th November 2001, 03:50 AM

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

AKSA · 18th November 2001, 07:41 AM

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

Damon Hill · 18th November 2001, 09:11 PM

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.

Vivek · 21st November 2001, 05:46 AM

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.

palesha · 26th November 2001, 07:11 PM

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

26th November 2001, 07:11 PM	#10
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	100W Why the output transistors not replacable by mosfet? How about replacing with IRF 540 & IRF 9540.

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17th November 2001, 06:21 AM	#1
Vivek diyAudio Member Join Date: Nov 2000 Location: Bangalore, India	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.

17th November 2001, 01:59 PM	#2
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	A bit complicated for my taste. I'd suggest this (I'm in the process of building one): http://sound.westhost.com/project3a.htm

17th November 2001, 05:12 PM	#3
P.Lacombe diyAudio Member Join Date: Jul 2001 Location: Orleans, France	Vivek, I agree with PaulB. Simpler, better. Regards, P.Lacombe

17th November 2001, 05:19 PM	#4
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	I forgot to mention that I amp I recommended can use 3055/2955 output transistors as well.

17th November 2001, 05:32 PM	#5
Damon Hill diyAudio Member Join Date: Mar 2001 Location: Auburn, WA (somewhere between Seattle and Tacoma) Blog Entries: 1	"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.

18th November 2001, 03:50 AM	#6
walker diyAudio Member Join Date: Nov 2001 Location: Perth West Australia	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

18th November 2001, 07:41 AM	#7
AKSA diyAudio Member Join Date: Sep 2001 Location: Melbourne, Australia	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

18th November 2001, 09:11 PM	#8
Damon Hill diyAudio Member Join Date: Mar 2001 Location: Auburn, WA (somewhere between Seattle and Tacoma) Blog Entries: 1	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.

21st November 2001, 05:46 AM	#9
Vivek diyAudio Member Join Date: Nov 2000 Location: Bangalore, India	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.