20k watt amp a document or a working class H

hienrich · 31st August 2006, 01:35 PM

hi,

is this amp really working

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

this is class h I think

http://www.geocities.com/pa_schematics/schematics.html

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

PMPO ?

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.

bobo1on1 · 1st September 2006, 12:20 AM

This looks somewhat familiar.

LOL

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.

31st August 2006, 01:35 PM	#1
hienrich diyAudio Member Join Date: Dec 2004 Location: City of Gentle People	20k watt amp a document or a working class H hi, is this amp really working or just only in paper....... this is class h I think http://www.geocities.com/pa_schematics/schematics.html

31st August 2006, 05:09 PM	#4
Danko diyAudio Member Join Date: Apr 2004 Location: Hungary	Maybe bridged to 1 ohm? :-)) This thing has to dissipate several kiloWatts at full power :-) __________________ Best regards, Danko

31st August 2006, 08:10 PM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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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31st August 2006, 03:34 PM	#2
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	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...

31st August 2006, 04:47 PM	#3
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	PMPO ?

31st August 2006, 05:17 PM	#5
rtarbell diyAudio Member Join Date: Sep 2005	I agree with ilimzn: A simple calculation will show that the maximum possible power delivered to the load is: V_peakV_peak / R_load = P_max ==> 115115 / 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.

31st August 2006, 08:22 PM	#7
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	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.

1st September 2006, 12:20 AM	#8
bobo1on1 diyAudio Member Join Date: Dec 2003 Location: Tulips, windmills and wooden shoes.	This looks somewhat familiar. LOL

1st September 2006, 02:07 AM	#9
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	What for building a 20kW power amp???

1st September 2006, 01:33 PM	#10
Nexus diyAudio Member Join Date: Aug 2003 Location: The Netherlands	It's an elektor design, I meant it was rated 2KW.

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