By creating a low power Pro Mini temperature beacon I removed the led's as well as the regulator and that works perfectly but the FTDI connection does not give any power anymore which in it self is no problem because I program the Pro Mini with an other Arduino (Nano). To power my nRF24L01 and temperature sensor they are connected directly with the battery pack of 2 AAA penlights. That works also very well, but I was wondering if I could re-establish the internal power line of the Pro Mini (for the now lower voltage obvious) to connect the radio and sensor power and ground lines again directly to the FTDI connector at the front side. That means that I have to reconnect the pins on the place where the LDO/regulator was seated with a little solder. Is that safely to be done and which pins should I connect then? It would save me the hassle of soldering extra wires to the batteries.
According to the schematic the FTDi connector feeds VCC directly, so the removal of the led and regulator should not disconnect the VCC. So either you have disconnected more or your Promini is not according the schematic.
Apparently my Pro Mini is not according to the original specifications. Nevertheless I want to try to make connections on the place where the regulator was located in order to repair the VCC and ground on the FTDI side. That is my question.
