separate power supply

[gaurav.p]

i m making a uC board where i want different power supply for logic and different supply for the output devices...............how this functionality can be configured.i hav made the board on the platform of atmega16 chip.

regards,
shakerobo

[Soeren]

Hi,

Just connect the grounds (0V lines) of the two power sources and use transistors or opto couplers to isolate between them.