[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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