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Old 19th October 2011, 01:49 PM   #1
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Default 500W RMS PA Amplifier

I want to diy an amplifier which gives 500W RMS at 8ohms load for pa application

Anybody could provide circuit diagram for such amplifiers
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Old 19th October 2011, 02:20 PM   #2
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If you're looking for something tried and tested, check out this one:
Click the image to open in full size.

More detail (and PCB) available at:
300/500W Subwoofer Power Amplifier

By coincidence, I found the one below yesterday. Looks interesting, but I don't know anything about it. Except that it could be from Elektor (as seen in the schematic style).
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Last edited by ingenieus; 19th October 2011 at 02:22 PM.
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Old 19th October 2011, 02:47 PM   #3
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At these powers your better off buying a commercial PA amplifier.

High power amplifiers are only for the experienced as they involve dangerous voltages.

Also the parts you need will cost about as much if not more than a off the shelf amp. Just the transformer which for a 500W amp would be around 1-2kVA will alone cost about as much as a readymade amp.
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Old 19th October 2011, 02:59 PM   #4
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...first we are not supposed to post directly esp schematics ...

even though rods circuit is a work horse and if designed and used properly is actually a very good amplifier given the simplicity is made .

the P68's i 've made working more than 3 years continuously and absolutely flawless at 95% of the power for more than 12 hours a day ( powers a subs in a movie theater )...

Still this amplifier features no protection and if abused will eventually fail ..... design properly will mean pcb from esp

as about elektor circuits even though in simulation might work ...in real life it will be a nightmare to stabilize ...

Apex circuits s a very nice option i think ....
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Old 20th October 2011, 02:15 PM   #5
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Default simple amplifier

something simple but i have not tested it
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Old 20th October 2011, 02:32 PM   #6
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Default pcb

hope it helps
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Old 21st October 2011, 02:09 PM   #7
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500W is about the limit of what is sane in a conventional class B amplifier. My guess is that a commercial PA amplifier in this class will either be class D or unaffordable. Not that there is anything wrong with class D, mind you. It is a lot more efficient, which helps to keep the weight down for one (less transformer and heat sink needed). But how does ultimate sound quality compare? Maybe somebody in the know can comment on this.
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Old 21st October 2011, 02:20 PM   #8
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I've seen used Peavey's for a few hundred bucks, and you'll never build an equivalent unit for less. At that power level you need a heavy transformer and I'd suggest 3 different levels/aspects of protection so the amp can survive real world use.
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Old 21st October 2011, 02:23 PM   #9
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Tekko is on to something. A quick look on Yahoogle turned up this beast for $450 + shipping.

Click the image to open in full size.

Gemini XP-6000 Professional 6000W Amplifier

It is rated at 600Wpc into 8 ohm with 0.1% THD. That's a lot of power for the bucks.

Is it possible to beat this price in a DIY class B project?

You will need two 1000VA transformers:

Click the image to open in full size.

And two (no, make that that four) 0.3K/W heat-sinks:

Click the image to open in full size.

Lots of these:

Click the image to open in full size.

And don't forget these little suckers:

Click the image to open in full size.

By now we have blown the $450 and the shopping list is still quite long...

Last edited by ingenieus; 21st October 2011 at 02:50 PM.
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Old 21st October 2011, 02:40 PM   #10
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any behringer EP2500 or EP 4000 will easily put 500 W per channel in to a resistive load of 8 R at 1Khz sine ..

problem is that it will not put exactly the same in inductive or real life load

cost of EP4000 is bit more than 300 euros

Then again ... 500w in class AB is walk in the park to make ...i can tell you more than 20 people that can easily create schematics of even more power ...

How well the schematic is implemented and how well the amplifier is protected from it shelf or against all the well known PA abuse is a totally different game ...

now ... from schematic to a product is a very loooooong way but not in sane Ingenius ....
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