By the way, should those series resistors on the TX/RX lines be 1K, or 10K? Somewhere someone told me to use 10K, but I can't remember anymore where ... Does it make a lot of difference, such as completely rendering those lines "dead", preventing a reprogram?
Dont forget decoupling caps BTW
Basically, if ONLY the external PSU is connected, I don't want (or need) the FTDI IC powered up.
I'm probably missing something...