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Power buffer for a mini3

post #1 of 6
2/8/10 at 4:09pm
Thread Starter 
Im venturing into power amps and had an idea for the shop. My original intention was to build a 2-3 watt tube amp for my desk speaker. However i already have a mini3/gamma2 combo box at the shop. I was thinking if i could some how build a power buffer (unity gain) to supply current it would sound nice (even more so if i could have it dc coupled).

12v pp converts to 4.24rms
4ohm speaker
that should make about 4.5 watts

that would require a 30va power supply at 12v.

Does anyone have some pointers on the interwebs on building power buffers?
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post #2 of 6
2/8/10 at 4:25pm
Why do you need a buffer?

YouTube - AMB Mini3 Headphone Amp powering Infinity 6.5" woofer
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post #3 of 6
2/8/10 at 5:28pm
Thread Starter 
Ya too bad the carrie has a 1watt power supply. Then again think of the poor thing driving a 4-8ohm sub on a 9v battery...
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post #4 of 6
2/8/10 at 5:49pm
If you check, most Infinity car audio is 2 ohm.

And you can build a Carrie with a 2W DCP chip....
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post #5 of 6
2/8/10 at 6:05pm
You can also theoretically parallel multiple 2W chips together and plug in multiple USB ports.
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post #6 of 6
2/8/10 at 6:18pm
As far as buffers go, something like this would probably work fairly well. I have a slightly beefier version (BD139/BD140) of the same design attached to what is basically a CMoy, and the whole thing powers some 6ohm, 5W KLH bookshelf speakers just fine. More than enough oompas for my ~12x18 home office, on those occasions when I don't want to listen to my all-tube AM/FM receiver...
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