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Summary of change:
Can anyone help me find out what value C12 should be? http://img291.imageshack.us/img291/7613/xx1dg.png Your load resistor is 100 Ohms. C12, in series with the 100 ohms wants to have an Xc of a lot less than 100 ohms (less than 10 ohms is good) at the baud that you will be using. Many similar circuits replace the capacitor with a short-circuit. The purpose of the capacitor is to reduce power consumption when there is no data flowing. If it were me, I would use a 10uF (because I have a lot of them in my parts bin!)although many different values would probably work well.
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