I have a project requiring a switch (I supply 4.8V, the switch stays off. I supply 5V, it turns on.) After some testing and asking several questions, I realized that the MOSFET I was using would not cut it. In EE.SE chat, I was informed that a comparator could solve my problems. Doing some research, I found a schematic for an OP Amp Comparator. Changing it a bit, I got this:
Assuming this works, how would I choose an OP amp to work here? Looking on Digikey and several other online electronics stores showed me that I know next to nothing about OP amp specifications.
Generally, I want it to be fast (Using the FET for high-speed switching), and can handle 5V plus a margin (call it 6-7V?) What should I look for on a spec sheet that represents those things? Also, since there were about 10 different option tables, what would be a good, nothing fancy, set of specs to work from?