Switch design with MOSFETs

[Sigmoid]

Hey,

I'm trying to figure out the principles of using MOSFETs as simple on-off switches.

The intended function of this design is to convert a standard, garden variety three terminal ON/OFF/ON switch into an incremental (zero/one/two) switch.

At one extremity (A on) no lights are on. In the middle (off) position the right light comes on. In the top (B on) position both lights are lit.



Did I get MOSFETs right? Or would there be a better way of solving this? Are the megohm resistors a good choice?

 

[duke37]

Megohm resistors are OK.

Just make sure that the FETs can stand 24V on their gates with some leeway.

 

[BobK]

I would go with lower resistors, more like 10K for more immunity to noise.

Bob

 

[(*steve*)]

And for faster switching speed