Quote Originally Posted by ERIK View Post
I found that not all mosfets produced acceptable results (some seemed to be too slow or something).
MOSFETs are a bit touchy that way. Gotta check the spec on the MOSFETs gate capacitance (or for that matter stray uF due to the circuit design itself).
Depends on what's driving the MOSFET. You might not have an 'active' turn off to the MOSFET, it just might 'bleed down' instead of being driven off. Those MOSFETs that weren't quite up to snuff might benefit from a pulldown (or pullup) resistor across the gate over to the drain or source. I built a circuit awhile back, used P-channel MOSFETs to drive a bank of LEDs. Turn off the driving circuit, everything was just fine, until about 10 minutes later, somehow the LEDs were gradually turning themselves on. Turns out my pullup to V+ on the P-channel MOSFET wasn't good enough. I had a 100K resistor from the gate to V+. Worked fine during testing because I didn't let it sit long enough. Swapped out the 100K for 10K, everything was much better, even the 'blending' as you call it looked better.