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Hello, Where would I be able to pick up a couple of 'general purpose' MOSFETs? (any chance for a sample?) I intend to use one as a relay to power a 6v DC motor which runs on 4 AA batteries, which in turn will be controlled via my $50 robot board...where can i find schematics on how to wire the MOSFET up? I have looked but my efforts have been fruitless...... Thanks.
OK. I know what you mean. There's a million MOSFETs out there. I use the HRF3205 N-channel MOSFET in my H-bridge design. Quite popular. Just connect the MOSFET between your motor and ground (MOSFET Drain to motor, MOSFET Source to ground). Connect the other motor lead to Positive. Connect the MOSFET gate to your controlling source. Thing is, you need at least 8V Vgs to turn the MOSFET all the way on, so you'll need an NPN transistor between the micro and the MOSFET.
Where would I be able to pick up a couple of 'general purpose' MOSFETs? (any chance for a sample?)
Hi,Quote from: Metal Slug 2 on February 19, 2009, 08:49:13 PMWhere would I be able to pick up a couple of 'general purpose' MOSFETs? (any chance for a sample?)The FDP8870 from Fairchild is not really a general purpose device, but a good choice for your app. whatever size your motor is.It handles up to 30V max. and a current of up to 156A with a R_ds_on of 4.1mΩ (i.e. 0.0041Ω).You should be able to get a few samples if you use a proper email (don't use Hotmail, Gmail etc.)http://www.fairchildsemi.com/pf/FD/FDP8870.html