xvibe
Member level 5
I have a problem with this circuit (see the atached file please).
When J3 is closed and J4 is open the led is on because the mosfet is conducting.
How could avoid this problem.
This circuit represent a backplane with two cards. And what I want is:
- J4 closed and J3 open or closed (doesn't matter) then LED2 is on.
- J4 open and J3 open or closed (doesn't matter) then LED2 is off.
R3 and R6 represents the loading of each card.
The problem is that or the mosfet is not turning off fast enough or ther's somenting wrong with the circuit.
What to do?
When J3 is closed and J4 is open the led is on because the mosfet is conducting.
How could avoid this problem.
This circuit represent a backplane with two cards. And what I want is:
- J4 closed and J3 open or closed (doesn't matter) then LED2 is on.
- J4 open and J3 open or closed (doesn't matter) then LED2 is off.
R3 and R6 represents the loading of each card.
The problem is that or the mosfet is not turning off fast enough or ther's somenting wrong with the circuit.
What to do?