7800W at 2ohm. Is this schematic going to work? what do you think.

[RealForce]

I want to build this amplifier. What do you think is this ok schematic according to you?

Thanks

[ontoaba]

No, it will blow in no time, and if it work, it may shocking and injuring you.

[sawreyrw]

Why do people post such silly stuff?

[RealForce]

Originally Posted by sawreyrw

Why do people post such silly stuff?

Why do you think that?


Ok than what do you think about this project. I really want to make this one and it has PCB and everything.

I think it is called AV1000

[bear]

How many amps do you draw from the wall to produce "7800 watts" output?

That's the first question you need to ask...

The next question is what will you do with this power, assuming you can build such a thing?

_-_-bear

[nigelwright7557]

Originally Posted by RealForce

I want to build this amplifier. What do you think is this ok schematic according to you?

Thanks

It looks very crude and simplistic.

There doesnt seem to be a proper bias circuit.

[kevinkr]

Originally Posted by RealForce

Why do you think that?


Ok than what do you think about this project. I really want to make this one and it has PCB and everything.

I think it is called AV1000

I think sawreyrw might have been responding to post #2..

In any event I can't imagine why you need so much power. It would be safer to build a number of smaller amplifiers to total the required power if you are driving subwoofers or the like. (I don't know of anything that can handle appreciably more than 1kW.)

Can you tell us what this amplifier is to be used for?

I'm a little concerned that the amplifier shown has no overcurrent limiting, thermal protection or otherwise. Power levels like this will require large heatsinks and forced air cooling. Output current at full power would be 65Arms or 92Apk, can't imagine that there is enough copper on those traces to handle that much current.

Edit: Actually looking at the second schematic I see it does have a rudimentary form of current limiting, without knowing the Vgs of the devices I cannot determine what the current limit clamps at.. This strikes me as an amp designed for about 1kW output however... (AV1000 a potential clue?)

Truthfully if you do need this kind of power and have AC mains that can provide >40A @ 240V (or >30A 3 phase 380V - 440V) then you might want to look for a surplus "gradient amplifier" - these come in power ratings of 10kW and beyond and will do 20 - 20kHz in a lot of cases at these power levels. Such an amplifier will have thermal and overload protection, and have all requisite safety agency approvals - something you probably want at these power levels. They usually offer internally configurable current or voltage output drive options, may also provide programmable V/I limiting for load protection.

[Sebastiaan]

Why my heart always skips a beat if I see plans like this... Well it is just me, I am scared as hell for high DC power rails voltages...

Where the hell you need so much current for. No woofer in this entire world can handle this for even a mS.

With kind regards,
Bas

[stratus46]

Originally Posted by RealForce

Why do you think that?


Ok than what do you think about this project. I really want to make this one and it has PCB and everything.

I think it is called AV1000

Well, for starters your MJE350 is a 300 device you're trying to run at 360 V p-p. The 1/2 watt 3300 ohm resistor will be dissipating 9.8 watts. The 1/2 Watt 1K resistor will be on fire. The power supply...... Whats not silly about all of this?

G²

[Andrew Eckhardt]

The speaker symbol is undersized. I'm at a loss for how you could get less than about -5 volts out of the first one (before the flames start), and I guess the body diodes are the output clamps. It also seems to have an inverting output fed back to the inverting input. It's definitely a joke.