5V power supply using 7805 with multiple outputs
It doesn't matter how wire you connect to the 7805's output. The only things matter is how much current you will ask for. According to the datasheet, the 7805 can provide 500mA. This mean the sum of the current on each branch have to be lower than this value. Otherwise, the chip will heat up and may not behave as usual. 







simulate this circuit &ndash; Schematic created using CircuitLab

Another condition: $$ V_{IN} \geqslant V_{OUT} + V_{DROPOUT}$$ If this condition isn't satisfy, the LM7805 won't guaranty 5V.