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Joined 2016
someone is telling porkies !
5200W into 2r0 is equivalent to 144Vpk into 2r0.
One cannot get that from a supply set to +-150Vdc.
And it needs to supply 72Apk when the voltage holds up at 144Vpk.
Now add on a reactive speaker load.
It won't meet a 5200 Watt specification.
5200W into 2r0 is equivalent to 144Vpk into 2r0.
One cannot get that from a supply set to +-150Vdc.
And it needs to supply 72Apk when the voltage holds up at 144Vpk.
Now add on a reactive speaker load.
It won't meet a 5200 Watt specification.
The 8pair output stage would make a good 600W into 8ohms stage.
That might even work as 1000W into 4ohms, but for how long?
But the whole front end and drivers would need a complete "design".
As is I doubt it will work.
That might even work as 1000W into 4ohms, but for how long?
But the whole front end and drivers would need a complete "design".
As is I doubt it will work.
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There are a lot of problems. At first, the rail voltage of 150V is extremely high, a little load impedance deviation results in a huge power shift. The former posting colleagues mentioned a big bang... and that's what's happening very quickly and merciless if the impedance is not what's expected. Besides that, the dimensioning of the Rs is nowhere realistic compared to the intended output at all.
If you want to realize an A/B amp with a that high output with a that low impedance, instead of high rail voltage you should change the design to class H or class D, which are both much more efficient and stable. Besides that, the power supply will become much cheaper.
If you want to realize an A/B amp with a that high output with a that low impedance, instead of high rail voltage you should change the design to class H or class D, which are both much more efficient and stable. Besides that, the power supply will become much cheaper.
I (again) took waaaay too long to reply.. 🙄
@AndrewT: Ofcourse, that's right. Besides the dimensioning, the design isn't up to it and, more important, isn't relyable. The MOSFETs don't have any current or thermal reserve and can soooo easily fry if the impedance deviates just a little bit. A class H (even without any protection) can easily withstand an impedance issue this design would fry upon this design would not.
@AndrewT: Ofcourse, that's right. Besides the dimensioning, the design isn't up to it and, more important, isn't relyable. The MOSFETs don't have any current or thermal reserve and can soooo easily fry if the impedance deviates just a little bit. A class H (even without any protection) can easily withstand an impedance issue this design would fry upon this design would not.
Nice to see the long, and well detailed answers.
I there anybody, who checked the Vds voltage of the IRFP250?
Sajti
I there anybody, who checked the Vds voltage of the IRFP250?
Sajti
I don't see any point in even discussing if the circuit is any good or not! Let's say for arguments sake it's a good bullet proof design.
1) What speaker system is it going to power?
2) What are you using for speaker cable and connectors to carry that current?
3) Power supply? Hell I would just take American 240v split phase and make a +/- 170v supply right off the AC line and transformer couple the input. But be careful with the speaker ground lead 😱
4) You want a PC board? Not for that output stage. Take A look at how big UPS systems are wired. All point to point on the high current stages.
The last question is WHY?
1) What speaker system is it going to power?
2) What are you using for speaker cable and connectors to carry that current?
3) Power supply? Hell I would just take American 240v split phase and make a +/- 170v supply right off the AC line and transformer couple the input. But be careful with the speaker ground lead 😱
4) You want a PC board? Not for that output stage. Take A look at how big UPS systems are wired. All point to point on the high current stages.
The last question is WHY?
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Answers to the questions:
1. A couple of 21SW152-loaded Othorns, of course
2. Battery charger cable
3. No you will not, you will use a surplus 240 to 120/240 10kva isolation transformer you get from somewhere like Skycraft
4. A combination of PCB and buss bar has been used in the big Crest and Crown amps for many years, and even the quckturn pcb houses are offering 2 or even 3 ounce copper nowadays
5 Why is quite simple - because it's never loud enough
1. A couple of 21SW152-loaded Othorns, of course
2. Battery charger cable
3. No you will not, you will use a surplus 240 to 120/240 10kva isolation transformer you get from somewhere like Skycraft
4. A combination of PCB and buss bar has been used in the big Crest and Crown amps for many years, and even the quckturn pcb houses are offering 2 or even 3 ounce copper nowadays
5 Why is quite simple - because it's never loud enough
Beside the fact that these circuit is complete nonsense it is extremely dangerous. Driving 200V devices on 300V rails ???
That's true. 🙄
😀
If you want to drive 2 Ohm, it's practically always because of using multiple drivers. So it would make much more sense if the amp power would come from several amplifiers, even a single dual VC monster sub can be driven with 2 amps. That would make the dimensions of the parts a lot easier, cheaper and the safety much, much better and you'd profit a lot from the higher damping factor, it sounds so much better, precise and controlled if you don't use 2 Ohm configurations.
Besides that, the redundancy gives you failsafe and the ability to drive the amplification over 2 or more circuits, no need for heavy current mains (don't know if that's the correct term, sry). If you still want to have huge power from a single power amp, probably best to look at PA amp circuits.
this is another APRIL fools day amp.........
there are those who would float circuits in the internet
and hope some guy would engineer to correct mistakes and then
reap the harvest....
there are those who would float circuits in the internet
and hope some guy would engineer to correct mistakes and then
reap the harvest....
This is a blameless amp gone berserk, therefore I love it. it's a passionate amp.
It's an amplifier for teenagers who wants to impress their friends.
It's blameful since it's gonna wrap the tapestries from the walls.
But I really think it works, it will deliver 5200 W / 2ohm, but the bias?!
It's an amplifier for teenagers who wants to impress their friends.
It's blameful since it's gonna wrap the tapestries from the walls.
But I really think it works, it will deliver 5200 W / 2ohm, but the bias?!
Brings to mind an April Fools episode of the Simpsons. When Bart put a can of Homer's beer in the paint shaker at the hardware store. When he opened it there was a mushroom cloud, sort of like what would happen one one turns on this amp.
I've been hit by flaming pieces of IRFP064's - it's not fun.
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