20k watt amp a document or a working class H

[hienrich]

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]

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]

PMPO ?

 

[Danko]

Maybe bridged to 1 ohm? )

This thing has to dissipate several kiloWatts at full power

 

[rtarbell]

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]

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]

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]

This looks somewhat familiar.

LOL

 

[Leolabs]

What for building a 20kW power amp???

 

[Nexus]

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

 

[Tweeker]

Well, heres a 3 megawatt video amplifier:
4 Burle 7835s are in the final.

An externally hosted image should be here but it was not working when we last tested it.

 

[hienrich]

so let say that this amp delivers a max 3500 watt 4ohm
load

my question, is this really working or just on paper?

or are there simpler approaches than these?

cheers

macweb

 

[TonyTecson]

only one way to find out, build it...

hey hienrich, can you have a look at www.pinoydvd.com, maybe you would like to post pics of your amps there...

 

[hienrich]

hi Tony

kumusta

its been long

better for u

you are in another world. yet proud to be pinoy

yes I hope one of these days I could post some pics of my projects.

tony, actually what am i obsessed for this time is building a

class H or a class G power amp, well class G is bit closer

to me since I have enough inventory of BJT's rather than Hextfet Mosfets in class H amps yet still have the thinking of building one.

hope also that you have some schemes for references since
I still have to learn more about Switching in class G and class H
power amps..


more power,

macweb

 

[sawreyrw]

20KW at 4 ohms is crazy.

 

[sam9]

This is an application for power tubes from Litton, Eimac, etc. For those guys 20kW is no big deal.