Looking for a Audio 5Kw AB class amp driver circuit

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#61
Hilarious! With the intended 5000W 500W audio system all the 'fresh white eggs' have become scrambled eggs before delivery. Is a camping kitchen for this purpose not better suitable in a rikshaw? And within budget too!
Nymeria
 
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#62

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#64
AudioSan said:
It seams to me that this guy wants someone to design a amp for him that he then can sell a lot of as a commercial product back in his country and then take the credit for the design.
"But, Chinese cheap products are dominating here. Suggest me any of your design that starts with lowest cost. For sure many customer wants good quality."
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Be polite and read carefully what I explained.
There is more thing other than money.
 
#66
We are all reading and answering politely.
Not our fault that the stated goal and resources are absolutely opposing, incompatible and impossible.
To say it politely.

Somebody gives the idea for buying componets.
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No physical combination of components on Earth will give you 5kW within
more or less 35~40 usd
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budget.
Not even 500W.

A raw 700VA PT , no supply components, no amplifier, no case/cabinet/preamp/hardware-nothing, will cost more than 40 U$D.

Let alone raw components to build a working amplifier.

NO CLUE
WASTE OF TIME
 
#68
JMFahey said:
We are all reading and answering politely.
Not our fault that the stated goal and resources are absolutely opposing, incompatible and impossible.
To say it politely.


No physical combination of components on Earth will give you 5kW within budget.
Not even 500W.

A raw 700VA PT , no supply components, no amplifier, no case/cabinet/preamp/hardware-nothing, will cost more than 40 U$D.

Let alone raw components to build a working amplifier.

NO CLUE
WASTE OF TIME
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Don't waste your time then.
If I were you, I will be overlooked at it.
 
#69
wg_ski said:
Class H is more straightforward and idiot proof than class D at this power level. Switching these currents in 10 Nanoseconds has conflicting requirements. You need devices large enough to handle 100 amps and get the heat out, yet small enough not behave as a distributed network. If you slow down the switching to prevent nuisance burnouts due to distributed effects you end up dropping down in the 70-80% efficiency range - not to mention the increased distortion - and you may as well use class H. 1 microsecond switching is ok for class H, and dissipation will be several hundred watts (average) and 5kW (peak) distributed among 10 or 20 power transistors spread out over a foot or more. This is at least possible with the construction techniques you are likely to use. A bank of MJL21194’s or 4281’s and a couple big low voltage hexfets to switch rails works just fine. Nothing special or exotic is needed, and you don’t need a an HFSS simulation of the complete board layout.

I’ve been developing a 5kW 4 step class H over the past 10 or so years. Been through multiple iterations. I’ve had snowflake prototypes working, but making something manufacturable, serviceable, and road-hardy is not simple. The mechanical construction is more challenging than the electronics, which was proven out 10 years ago. And even the protection circuitry is more involved than the amplifier itself.
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Among all the participants in this flow I should give you best respect because you wrote something special from your experience. Looking at your response its true 5kW is challenging due to heat dissipation and mechanical management. " current" is a big issue. I am looking for few types of classAB those has catagory on their functions, an acceptable topology that can be simulate and analyze even with mathematical formulations.
Lets start will low power compared 5kW.
 
#70
indra1 said:
Common horn type PA speaker comes in 20-60W type. Larger watts are not used for mobile purposes, except for riot control. I do not think you will need more than 70W amplifier for stated requirement and Class D should fit the need better than class AB.
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Thanks Indra. Your estimation would be reasonable. Now for 70W of amplifier what kind of DC supply we should use then plus/munus 35 volt.

As a prototype how about this link, 70W Class AB Hi-Fi Amplifier
 
#73
For this kind of power (50-60W) and if you want to stay in class AB you might want to consider LM3886 chip amps.
PSU included (without transformer or heatsinks) stereo sets can be found on Ebay around 25$.
Simply adding a 200-250VA 25-0-25V transformer might still fit in your price range.
Not 5000W of course but they sound surprisingly good.
Cheers,

Jacques
 

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#74
For this kind of power (50-60W) and if you want to stay in class AB you might want to consider LM3886 chip amps.
PSU included (without transformer or heatsinks) stereo sets can be found on Ebay around 25$.
Simply adding a 200-250VA 25-0-25V transformer might still fit in your price range.
Not 5000W of course but they sound surprisingly good.
Cheers,
Click to expand...

Great!
Single chip does many thing, isnt it?
It should have technical note , right?
 
#79
Hasan2019 said:
Lets start will low power compared 5kW.
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So how low a power? How many times do you move the decimal point? Each decimal place will give a different answer as to what is best, and change the level of difficulty. 50kW borders on impossible, 5kW is a b*(#, 500 is challenging, 50 is easy and 5 is dirt simple, regardless of amp class (A,B,D,G,H,I....)

So what are the real care-abouts at your desired power level? Low power consumption? Low heat? Overload tolerance? Easy design? Easy build? Cheap? There is no way to get it all, except at the very lowest power levels.

How much power you *need* depends on your speakers. The smaller you make the speakers, the more power you actually need.
 
#80
wg_ski said:
So how low a power? How many times do you move the decimal point? Each decimal place will give a different answer as to what is best, and change the level of difficulty. 50kW borders on impossible, 5kW is a b*(#, 500 is challenging, 50 is easy and 5 is dirt simple, regardless of amp class (A,B,D,G,H,I....)

So what are the real care-abouts at your desired power level? Low power consumption? Low heat? Overload tolerance? Easy design? Easy build? Cheap? There is no way to get it all, except at the very lowest power levels.

How much power you *need* depends on your speakers. The smaller you make the speakers, the more power you actually need.
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Offcourse you said well.
Depending on the size of load I have to choose one that fits best. I do agree with you we won't get a perfect design in low cost. According to what jacques antoine said, TI's LM3886 has different load application depending on VCC. Cant we save more transistors with this one?
 
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