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Old 31st August 2006, 01:35 PM   #1
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Question 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

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Old 31st August 2006, 03:34 PM   #2
ilimzn is offline ilimzn  Croatia
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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...
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Old 31st August 2006, 04:47 PM   #3
MikeB is offline MikeB  Germany
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Old 31st August 2006, 05:09 PM   #4
Danko is offline Danko  Hungary
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Maybe bridged to 1 ohm? :-))

This thing has to dissipate several kiloWatts at full power :-)
Best regards, Danko
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Old 31st August 2006, 05:17 PM   #5
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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.
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Old 31st August 2006, 08:10 PM   #6
Eva is offline Eva  Spain
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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.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 31st August 2006, 08:22 PM   #7
Tim__x is offline Tim__x  Canada
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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.
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Old 1st September 2006, 12:20 AM   #8
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This looks somewhat familiar.

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Old 1st September 2006, 02:07 AM   #9
Leolabs is offline Leolabs  Malaysia
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What for building a 20kW power amp???
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Old 1st September 2006, 01:33 PM   #10
Nexus is offline Nexus  Netherlands
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It's an elektor design, I meant it was rated 2KW.
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