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Rotterdam, The Netherlands
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I made a breadboard with an arduino atmel 328p chip that is behind a LM7805 voltage regulator. To upload the software or to download the data stored in the project I use the FTDI usb to serial converter from Arduino. Up to now I remove the external voltage before I connect the FTDI to the 6 pinned connector on my breadboard.

My question is, do I damage the FTDI breakout board by also applying my external voltage via the LM7805? In other words, do I need to include an N channel MOSFET with a voltage comparator as on the arduino uno board to prevent possible damage or, is the FTDI breakout board able to handle this issue?

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Manchester (England England)
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Up to now I remove the external voltage before I connect the FTDI to the 6 pinned connector on my breadboard.
A wise thing to do, keep on doing it.

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My question is, do I damage the FTDI breakout board by also applying my external voltage via the LM7805?
You should never connect the source of two voltage regulators together.
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There is no need to connect the 5V from the FTDI adapter to your circuit itself if you are providing another supply for the 5 volts.
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