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Old 4th December 2012, 07:16 PM   #1
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Arrow 250-400watt audio amplifier

You can see it at 250-400W Power Amplifier | Electronic City
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Old 4th December 2012, 08:03 PM   #2
DuncanV is offline DuncanV  Netherlands
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...no output stage bias current?
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Old 4th December 2012, 10:02 PM   #3
AJT is offline AJT  Philippines
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classB....better place a 47ohm 5watt resistor from bases of darlington to output node...
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Old 5th December 2012, 01:04 AM   #4
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250W/4R with a +/-40V power supply?
Have you tested this or just estimated it from theoretical maximum figures?
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Old 6th December 2012, 11:32 AM   #5
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Quote:
Originally Posted by Ian Finch View Post
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.
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Old 6th December 2012, 12:13 PM   #6
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by mincior View Post
Quote:
Originally Posted by Ian Finch View Post
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?
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Last edited by AndrewT; 6th December 2012 at 12:17 PM.
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Old 6th December 2012, 03:33 PM   #7
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Quote:
Originally Posted by AndrewT View Post
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 diseo then this is of no use. A much power really comes. : Confused:
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Old 6th December 2012, 05:38 PM   #8
AndrewT is online now AndrewT  Scotland
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What's the confusion?
Some of us here actually try to help.
Is that me being unhelpful again?
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Old 7th December 2012, 12:27 AM   #9
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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?
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Old 7th December 2012, 12:51 AM   #10
jaycee is offline jaycee  United Kingdom
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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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