In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dpaton wrote:

Andrew-

Yup, you've got L-pads.

Unfortunately, the only ways to get a digital L-pad would be a large series of switched resistors (12 steps = 48 resistors) or build some kind of motor control. If you're really into DIY, I'd suggest a multichannel amplifier, and that you control the line level input to each channel rather than sinking output power. Not only is the line level control option more efficient, it's much higher performance, since those transformers slaughter the frequency response, especially at the low end. If you're a hardcore DIYer, you should [url=http://forums.parallax.com/forums/default.aspx?f=15&m=65084]check out this thread[/url]. Chris and I are working on an LM3886 based amplifier module offline (50ish W at 8 ohms), and I'll be publishing the gerbers and layout once it's all done. There's also a lot of goodies in there on high quality digital volume control, power supplies, esoteric display types, and preamp stuff. Getting a 10ch 50WPC amp together should be possible for under $200 if you scrounge.

-dave

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