250-400watt audio amplifier

[mincior]

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

[DuncanV]

...no output stage bias current?

[Tony]

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

[Ian Finch]

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

[mincior]

Originally Posted by Ian Finch

250W/4R with a +/-40V power supply?
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]

Originally Posted by mincior

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

Originally Posted by Ian Finch

250W/4R with a +/-40V power supply?
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]

Originally Posted by AndrewT

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]

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

[SERGIODS]

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]

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.