Reccomendation for easy, high-power, and somewhat crappy Class D amplifier for a sub. - diyAudio
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Old 20th November 2006, 05:27 AM   #1
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Default Reccomendation for easy, high-power, and somewhat crappy Class D amplifier for a sub.

I'm looking to either hack an old Cambridge Ensemble passive subwoofer into a powered subwoofer, or build one using one of the Silver Flute drivers from Madisound.

Either way....I need an amplifier. Super-low-distorion audiophile grade stuff, UCD-derived super-sampled wonders of engineering, and elegant Tripath masterpieces....need not apply. I'm looking for no more than .1% THD at 100hz. Not Khz, but one hundred hertz.

I'd like to be able to use a cheap power supply - ideally, the amp would run on either 12v, 24v, or 48v (the voltages most commonly found in industrial surplus SMPS power supplies.) Only about 40 watts of low-distortion power is really needed, although more is certianly a good thing.

I should also mention that I'm no expert at SMD work; though I think I could handle SOIC stuff well enough, anything with itsy-bitsy leads is out of my leauge. Through-hole is, of course, ideal.

So, any reccomendations? Something I could get for free from TI (huzzah for samples!) would be excellent.
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Old 20th November 2006, 05:41 AM   #2
BWRX is offline BWRX  United States
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Have you seen the thread where I've been developing an evaluation board for the TI TAS5261? You can check it out here: Texas Instruments TAS5261 You can jump to the middle of the thread and read on for the more up to date information.

I've already ordered the boards and parts, but might have an extra kit left over if you're interested. These haven't been tested yet either, but I see no reason why it shouldn't work. Regardless, I plan to get a board built up as soon as possible once everything comes in.
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Old 20th November 2006, 06:46 AM   #3
Fin is offline Fin
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Default Smps

Is this any use for your application?
SMPS for Lepai T-Amp

They are universal input voltage so they will work in the US....and the seller tells me that he will ship to the US.
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Old 20th November 2006, 12:07 PM   #4
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I think a 41hz.com AMP11 would probably be perfect. It takes a single supply up to 36V and will deliver the amount of power your looking for.

Its only $36 + $7 shipping; can't beat that.

BTW, Fin..... give it a break already man. You've plugged those supplies in like 10 different threads already. You working on commission?
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Old 20th November 2006, 12:16 PM   #5
Fin is offline Fin
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Quote:
Originally posted by theAnonymous1

BTW, Fin..... give it a break already man. You've plugged those supplies in like 10 different threads already. You working on commission?
3 to be exact...and just trying to help. I thought that is what this site was all about. And - how much commision could there possibly be on a $3.50 sale????????? Please!
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Old 20th November 2006, 12:41 PM   #6
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Quote:
3 to be exact...and just trying to help. I thought that is what this site was all about. And - how much commision could there possibly be on a $3.50 sale????????? Please!
Just bustin' your chops Fin, didn't mean to get you riled up.
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Old 20th November 2006, 01:02 PM   #7
ssmith is offline ssmith  France
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Sorry to jump in, but how would this work -- do you just use the amp (like the class-D) and put a passive low pass filter on its output before the sub?
I have similar requirements, but don;t want to go for a big plate amp...
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Old 20th November 2006, 03:30 PM   #8
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I'd use an active Linkwitz-style filter on the input.
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Old 20th November 2006, 10:29 PM   #9
Fin is offline Fin
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Quote:
Originally posted by theAnonymous1


Just bustin' your chops Fin, didn't mean to get you riled up.

No worries Anonymous1. And I'll lay off the power supplies.
I suppose I do have a hidden agenda.....but it is only to get someone else (who knows more about these things than I do) to try one and share some ideas on implimentation.
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