Stereo Amplifier |
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| There's not too
much to say about this yet -- this is the amp that drives the pair of
speakers embedded in the arch above my head, and as with most of the
units that are on most or all of the time, one of the major design
issues is standby power dissipation. All initial testing has been done
with an excellent little Sony automotive unit, the 20-watt-per-channel
XM-2025, though this is now quite a few years old and probably not the
best final choice for the Microship. Besides, it's a great little amp
for my office MP3 system... <grin>
Note that the audio amp is a black box with basically preset gain (easily tweakable in the Sony with a screwdriver); we still have to come up with a master volume/tone control, presumably in a unity-gain preamp. Headphone outputs are needed as well. |
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We have recently
discovered a Texas Instruments product evaluation module that looks
interesting: the 10-watt TPA032D02 class D (digital) audio power amp.
There's a fascinating PDF data sheet available here
-- the standby current is only 2.5 mA when the audio is muted! |
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