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The power is provided from a 7.2v 180ma transformer
another stupid-check, make sure only one program that is running on your computer is using com1. sometimes i might have hyperterminal using com1, causing conflicts.
$3 for chip$12 for shipping and handling
Maybe 2 chips, pots, leds, socket holders, what else?
What kind of tools are you talking about? more specificallly.