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Class D Switching Power Amplifiers and Power D/A conversion

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Old 4th November 2004, 10:45 PM   #11
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Im just running a single 15" DVC sub (dual 1.5ohm coils)
its definatly not a regulated amp, i may well have a play and see what i can do. If not i guess i will have to invest in another amp or 2, and get sub reconed to dual 1ohm coils.
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148.6dB In Car System, needs to get louder i want 150dB+
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Old 5th November 2004, 02:26 AM   #12
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Why do you list USA amps as your homepage? Are you affiliated with them? Something is fishy here.
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Old 5th November 2004, 05:13 AM   #13
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Why not use more a efficent speaker/enclosure to make better use of the power you already have?
5KW is alotta juice.. Don't forget about the 2-3 extra alternators to power it..
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Old 5th November 2004, 05:27 AM   #14
HFGuy is offline HFGuy  Canada
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How about this ?

If you want to break the 150dB SPL barrier try this. Forget about amps, even class D isnt that effecient when you add a switching power supply, and has limited current supply. So assuming you only want to beat the 150dB mark with a test tone you can use a power inverter

Start with a DC-DC converter followed by a IGBT microcontrolled power inverter. The output will be nasty as hell ( closer to square wave then a sine wave, but you'll only get the fundamental harmonic ) This is how large AC-motors are driven. You can vary the frequency by adjusting the output gate signals for the IGBTs.



P.S. DONT KILL YOURSELF IN THE PROCESS
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Old 5th November 2004, 10:01 AM   #15
tiki is offline tiki  Germany
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What about this insane idea?
The bridge circuit uses the resonant frequency of the 100H/100000F LC-series. It has to be tuned carefully therefore.

But you need much more appropriate Mosfets to handle the 4000Apk AC current.
The current is flowing through the inductor and the caps too. Calculate for the maximum ripple current of the caps (you would need ~100 Sikorel caps instead of 10 in the simulation, don't cook them).

Good luck, Timo
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Old 5th November 2004, 05:39 PM   #16
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sounds interesting tiki,

and kilowattski, the reason my homepage is set as USAMPS is:
1) because i like their amps(although they are out of my price range) i have borrowed a couple from the guy who is a friend of mine and the UK importer of them.
2) They are great amps and are rock solid, ive never seen one break unlike SPL Dynamics amps which i see go pop regularly.
3) and finally i dont have my own homepage so thought i would just put a good link in there.
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148.6dB In Car System, needs to get louder i want 150dB+
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Old 5th November 2004, 05:40 PM   #17
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ohh i wish i was affiliated with them then i could probably afford to run their kit rather than finding ways to maake the best use from the limited kit i have.
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148.6dB In Car System, needs to get louder i want 150dB+
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Old 5th November 2004, 09:34 PM   #18
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Bypass the amp all together. Buy a 7000 watt gasoline generator and hook the 220V output straight to the woofers. You can adjust the govener to get the frequency you need (40 hz to 70 hz)
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Old 7th November 2004, 11:17 PM   #19
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thats a good idea, i hadnt thought of that, i know the sub i use can cope with being wired directly into a mains socket, thanks
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Old 8th November 2004, 10:12 AM   #20
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Well, the Zappulse modules can get about halfway to your rated power in bridge mode. Using more drivers AND more amps (seperately) would give you an extra 3dB output and also move the amp into a more reasonable current range.
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