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Old 22nd June 2012, 08:12 PM   #1
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Default BUF634T Power Amp: Do it?

So I just purchased a bunch of BUF634T and was thinking about making a power amp out of them since they can be so easily paralleled. How does 40 per channel sound in a BTL configuration? With regluated +/-18V supplies that should be good for a clean 40Wrms per channel and almost 3W of Class-A goodness.

Does this sound like a stupid waste of nearly $600 in parts (payed way less than that btw)? I could easily sell them for a profit, but wasting good parts on dumb ideas is an addiction of mine.

I like simple, so I would just wrap them in the feedback loop of something like this....

Click the image to open in full size.
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Old 22nd June 2012, 08:18 PM   #2
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sell them and burn bunch of mosfets or jfets in some project
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Old 22nd June 2012, 08:27 PM   #3
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Quote:
Originally Posted by Zen Mod View Post
sell them and burn bunch of mosfets or jfets in some project
Too dumb for discrete circuits; I prefer to stay out of the solid state forum where the big boys play. The "stupidness" of this idea is the only real motivator here.
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Old 22nd June 2012, 08:33 PM   #4
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then just go for it

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Old 22nd June 2012, 08:45 PM   #5
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BUF634T is a unity gain buffer. Where's the voltage gain coming from? The schematic you show is not relevant!. There's no inverting input accessible to you.
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Old 22nd June 2012, 09:03 PM   #6
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Originally Posted by Antoinel View Post
BUF634T is a unity gain buffer. Where's the voltage gain coming from? The schematic you show is not relevant!. There's no inverting input accessible to you.
Sorry, the picture is of the balanced output circuit I would use to drive the buffers for a BTL configuration. The buffers would be inserted between the op-amp outputs and feedback resistors.

R1=20K
R2=1k
R3=19K
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Old 22nd June 2012, 09:15 PM   #7
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Now you're cooking! Maybe the attached pdf is similar to your approach. Best regards.
Attached Files
File Type: pdf BridgeBUF001.pdf (14.7 KB, 106 views)
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Old 22nd June 2012, 09:39 PM   #8
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Yes, similar. I think the circuit I posted looks more elegant to me. I really couldn't tell you the pros/cons of either configuration though.
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Old 22nd June 2012, 09:59 PM   #9
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I can already see your build. A printed circuit board [say 2 feet long by 6 inches wide per channel] with 2 rows of repeating low power amplifying units. Clearly, the BUFs will be on heatsinks along both of the long sides of the PCB. Their power outputs will then merge to the center of the PCB via small ohm high watt resistors [for isolation]. This build is feasible. Best regards.
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Old 22nd June 2012, 10:28 PM   #10
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No dumb idea. See
Doug Selfs NE5532 Power Amp. Thoughts anyone !

Last edited by franzm; 22nd June 2012 at 10:32 PM.
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