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hienrich 31st August 2006 01:35 PM

20k watt amp a document or a working class H

is this amp really working

or just only in paper.......

this is class h I think

ilimzn 31st August 2006 03:34 PM

115V highest rail gives approx 750W into 8 ohms, 1500 into 4 ohms, 3000 into 2 ohms... so I don't see where the 20000W figure comes from...

MikeB 31st August 2006 04:47 PM


Danko 31st August 2006 05:09 PM

Maybe bridged to 1 ohm? :-))

This thing has to dissipate several kiloWatts at full power :-)

rtarbell 31st August 2006 05:17 PM

I agree with ilimzn:

A simple calculation will show that the maximum possible power delivered to the load is:

V_peak*V_peak / R_load = P_max

==> 115*115 / 4 = 3306.25 watts for peak power in to a 4 ohm load

I have NO idea where the 20,000W claim comes from.

He has what appears to be a nifty rail switching controller, but regardless of whether the amplifier runs in Class AB, B, G, or H, the theoretical absolute maximum power is given by the above formula. The only way to increase the max power is to either have a smaller load (like a 1 ohm speaker, which yields 13225W_peak according to the same formula), or increase the rail voltages.

Eva 31st August 2006 08:10 PM

Given the amount and model of output and switching devices, it seems to be intended to produce 5KWrms @ 1ohm single ended and 10KWrms @ 2 ohm bridged. The 20KW rating is probably the peak output for the latter case.

Tim__x 31st August 2006 08:22 PM

I sure hope he never tests his "stun gun" schematic. Output current is limited only by cap ESR. There's nothing to stop it from permanently "stunning" it's target. :dead:

bobo1on1 1st September 2006 12:20 AM

This looks somewhat familiar.


Leolabs 1st September 2006 02:07 AM

What for building a 20kW power amp???

Nexus 1st September 2006 01:33 PM

It's an elektor design, I meant it was rated 2KW.

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