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Mosfets
- Thread starter Woody213
- Start date
Yes, they take the amp load off the switch. Well pretty much
I use them a lot at work and in my hobbies what do you want to know. metal oxide semiconductor field effect transistors are fun.
laurie9300
Member For 5 Years
Yes......you got it........they are really a transistor, but think of them just like a relay. They use a low amp signal to switch the high amp supply. There is a small voltage drop as a consequence, but not much............
If you just stuck the switch in between the battery and the coil the strong current can cause the switch contacts to weld themselves together. You'd need to remove the battery or the atty to stop it from firing. There would also be arcing between the contacts when you activate the switch that may eventually reduce current flow to the coil and/or cause the switch to get hot.
laurie9300
Member For 5 Years
What MD said ^^^^^^^^^
The only switches available that can handle the amps required are the size of a loaf of bread! Anyone who tells you otherwise is lying............
This may help
http://www.ti.com/lit/an/slva139/slva139.pdf
http://www.ti.com/lit/an/slva139/slva139.pdf