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-   -   250-400watt audio amplifier (http://www.diyaudio.com/forums/solid-state/224983-250-400watt-audio-amplifier.html)

mincior 4th December 2012 07:16 PM

250-400watt audio amplifier
 
You can see it at 250-400W Power Amplifier | Electronic City

DuncanV 4th December 2012 08:03 PM

...no output stage bias current?

AJT 4th December 2012 10:02 PM

classB....better place a 47ohm 5watt resistor from bases of darlington to output node...

Ian Finch 5th December 2012 01:04 AM

250W/4R with a +/-40V power supply? :bigeyes:
Have you tested this or just estimated it from theoretical maximum figures?

mincior 6th December 2012 11:32 AM

Quote:

Originally Posted by Ian Finch (Post 3270896)
250W/4R with a +/-40V power supply? :bigeyes:
Have you tested this or just estimated it from theoretical maximum figures?

Hello . Not personally tested. I have designed the pcb for my friend MadMax. This project belongs him.

AndrewT 6th December 2012 12:13 PM

Quote:

Originally Posted by mincior (Post 3270536)

Quote:

Originally Posted by Ian Finch (Post 3270896)
250W/4R with a +/-40V power supply? :bigeyes:
Have you tested this or just estimated it from theoretical maximum figures?

typical Beginners' mistake. And as Beginners they are excused, this is a learning Forum.

It's the "NOT Beginners" that promulgate this type of useless information and are simply lies, that get up my nose.

Now back to the learning for Beginners.
250W into 4ohms is equivalent to 44.7Vpk and 11.2Apk delivered simultaneously to the 4r0 load.

Expect the supply rails for the 250W amplifier to be about +-55Vdc, not +-40Vdc.
A 37Vac+37Vac to 40Vac+40Vac transformer of about 400VA to achieve target performance. If you want two channels then two transformers or double the VA requirement.

Yet another unhelpful post?

SERGIODS 6th December 2012 03:33 PM

Quote:

Originally Posted by AndrewT (Post 3272996)
typical Beginners' mistake. And as Beginners they are excused, this is a learning Forum.

It's the "NOT Beginners" that promulgate this type of useless information and are simply lies, that get up my nose.

Now back to the learning for Beginners.
250W into 4ohms is equivalent to 44.7Vpk and 11.2Apk delivered simultaneously to the 4r0 load.

Expect the supply rails for the 250W amplifier to be about +-55Vdc, not +-40Vdc.
A 37Vac+37Vac to 40Vac+40Vac transformer of about 400VA to achieve target performance. If you want two channels then two transformers or double the VA requirement.

Yet another unhelpful post?

undsperdicio diseñño then this is of no use. A much power really comes. : Confused:

AndrewT 6th December 2012 05:38 PM

What's the confusion?
Some of us here actually try to help.
Is that me being unhelpful again?

SERGIODS 7th December 2012 12:27 AM

Hello Andrewt:

What I want to know is what is the maximum power excactamente that amplifier.

It is justifiable to make that circuit.
What is your power maximum?

jaycee 7th December 2012 12:51 AM

I'd say around 90W into 8 ohms. The number of output transistors added is irrelevant. It is the maximum output voltage swing that defines the output power. The number of output transistor pairs simply allows handling of the required current.

The circuit will also perform poorly. There is no bias on the additional output transistors, so they will operate in class B and cause distortion. There is also no drive stage for these transistors so the amplifier IC will spend a good deal of its max output current driving this stage, further increasing distortion.

There is no such thing as an "easy"/"cheap" powerful amplifier.


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