T
tempus fugit
- Jan 1, 1970
- 0
Hey all;
I'm trying to design a circuit that will ground a signal when the control
voltage is applied, like this:
signal
o
|
|
|
o
|
||-+
||<- N-channel MOSFET
control voltage o--------------|--------o-||-+
.-. |
| | o
| | 10K |
'-' |
| o
| |
=== ===
GND GND
So, when I apply a logic hi (5v) to the gate, the signal should be muted
because it is grounded. This part I'm pretty sure I got OK. Now, when I
remove the control signal, will the signal be un-muted? I would think so,
but I have tried this with a J111, and I need to actually apply a negative
voltage to the gate to get it to turn off. Is it different in the case of a
MOSFET?
Thanks
I'm trying to design a circuit that will ground a signal when the control
voltage is applied, like this:
signal
o
|
|
|
o
|
||-+
||<- N-channel MOSFET
control voltage o--------------|--------o-||-+
.-. |
| | o
| | 10K |
'-' |
| o
| |
=== ===
GND GND
So, when I apply a logic hi (5v) to the gate, the signal should be muted
because it is grounded. This part I'm pretty sure I got OK. Now, when I
remove the control signal, will the signal be un-muted? I would think so,
but I have tried this with a J111, and I need to actually apply a negative
voltage to the gate to get it to turn off. Is it different in the case of a
MOSFET?
Thanks