I'm going an 16 X 48 LED matrix & the attachment shows how I drive a Row from a PIC micro PIN.Columns are driving from a ULN2803 as well.I have 16 rows, so I'm multiplexing rows @ 1/16th rate.
In this design for 595 Shift registers and to drive row signal from PIC pin I use a 5V supply.But for the LED load I use 12V. Because in future I need to add more LEDs to a single pixel.So 12V is fine.Also it will override the darlington saturation voltages as well.
Is my design ok?Will there be enough current from the row side to drive 48 LEDs?
In this design for 595 Shift registers and to drive row signal from PIC pin I use a 5V supply.But for the LED load I use 12V. Because in future I need to add more LEDs to a single pixel.So 12V is fine.Also it will override the darlington saturation voltages as well.
Is my design ok?Will there be enough current from the row side to drive 48 LEDs?