I have a eight LEDs already wired up with a wire on the anode. Since only one LED is planned om being on at a given time I placed the current limit resistor on the cathode that they all share.
I need to be able to switch these with an N Channel logic level MOSFET. Every configuration I have seen for MOSFET switches put the load on the drain.
I guess I wasn't thinking when I wired up the LEDs because I probably should have made them common anode to suit that configuration. Well it is too late they are already wired.
The only think I could think of was to place the load (LED) on the source. With the anode of each LED tied to the source and the cathode via the current limiting resistor tied to ground.
I gave it a try but when I do this, my source appears to oscillate then the gate is tied high.
As there anyway to get this to work? Or am I going to have to have current limiting resistors for each LED?
I need to be able to switch these with an N Channel logic level MOSFET. Every configuration I have seen for MOSFET switches put the load on the drain.
I guess I wasn't thinking when I wired up the LEDs because I probably should have made them common anode to suit that configuration. Well it is too late they are already wired.
The only think I could think of was to place the load (LED) on the source. With the anode of each LED tied to the source and the cathode via the current limiting resistor tied to ground.
I gave it a try but when I do this, my source appears to oscillate then the gate is tied high.
As there anyway to get this to work? Or am I going to have to have current limiting resistors for each LED?