I'm looking for common MOSFETs to do some experimenting with. They should be able to switch at least 3A at 15V, have a low on resistance for power efficiency and also be quite cheap.
I require all four types, that is P & N channel, both depletion and enhancement mode.
So far I've found the following enhancement mode MOSFETS:
I think these MOSFETs will do the job. However, I'm struggling to find comparable depletion mode MOSFETs. Can anybody make a recommendation?
In general, is there a preference between using a N channel or P channel for switching purposes? I understand with a P channel the source is connected to positive while with an N channel the source is connected to ground. Practically does this make a difference?