BUF634T Power Amp: Do it?

theAnonymous1 · 22nd June 2012, 07:12 PM

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....

Zen Mod · 22nd June 2012, 07:18 PM

sell them and burn bunch of mosfets or jfets in some project

theAnonymous1 · 22nd June 2012, 07:27 PM

Quote:

Originally Posted by Zen Mod

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.

Zen Mod · 22nd June 2012, 07:33 PM

then just go for it

Antoinel · 22nd June 2012, 07:45 PM

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.

theAnonymous1 · 22nd June 2012, 08:03 PM

Quote:

Originally Posted by Antoinel

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

Antoinel · 22nd June 2012, 08:15 PM

Now you're cooking! Maybe the attached pdf is similar to your approach. Best regards.

theAnonymous1 · 22nd June 2012, 08:39 PM

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.

Antoinel · 22nd June 2012, 08:59 PM

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.

franzm · 09:32 PM

No dumb idea. See
Doug Selfs NE5532 Power Amp. Thoughts anyone !

22nd June 2012, 07:12 PM	#1
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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.... __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

22nd June 2012, 07:18 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	sell them and burn bunch of mosfets or jfets in some project __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

22nd June 2012, 07:33 PM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	then just go for it __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

22nd June 2012, 08:39 PM	#8
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

22nd June 2012, 09:28 PM	#10
franzm diyAudio Member Join Date: Dec 2010	No dumb idea. See Doug Selfs NE5532 Power Amp. Thoughts anyone ! Last edited by franzm; 22nd June 2012 at 09:32 PM.


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22nd June 2012, 07:45 PM	#5
Antoinel diyAudio Member Join Date: Jan 2012 Location: Pennsylvania Blog Entries: 1	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.

22nd June 2012, 08:59 PM	#9
Antoinel diyAudio Member Join Date: Jan 2012 Location: Pennsylvania Blog Entries: 1	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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