[Noisebridge-discuss] class-D amplifier test successful

Jake jake at spaz.org
Fri Jun 3 00:45:41 UTC 2011


pictures:
http://spaz.org/~jake/pix/11-5/IMG_2006.JPG
http://spaz.org/~jake/pix/11-5/IMG_1902.JPG

first test of amplifier (video):
http://www.youtube.com/watch?v=d28rTEvcTJM

close-up video:
http://www.youtube.com/watch?v=mqnnc4wnQ_c

It's only for bass - definitely nothing over 5khz with this design.  It 
has a built-in lowpass filter which Lilia is still working on.  She did 
all the software, i did most of the hardware.  The DIP switches set the 
crossover frequency and window size, i think.

at this time it's running about 200 watts, but the design is scalable and 
the next step is to make a 2000 watt version based on the same idea.

It uses an UNO32 eval board for a PIC32 microprocessor, converting the 
audio into PWM for a class-D push-pull setup running transformerless on 
rectified mains.  The next version will have a power factor corrector 
recycled from a prototype apple supercomputer.

-jake



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