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Old 11-11-2008, 11:12 PM   #3 (permalink)
tangomar
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The microcontroller + AD / DA isn't that expensive (MCU AVR 128K FLASH 1.6V 44-QFN - ATXMEGA128A4-MU).
$7 + some basic PCB + voltage regulator, maybe one op-amp to amplify the DA signal... I would guess ~$20. But I don't know too much about PCB pricing.
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