Ground something, for a short time
Something I like to do for reset circuits is a one-shot circuit. At least I think thats what it is called. It looks something like this:







simulate this circuit &ndash; Schematic created using CircuitLab

V1 would be your supply voltage, and the output of the XOR is your "reset" signal. Basically, when your supply voltage starts to come up, the top input of the xor is high, and the RC circuit is charging up so it will be low. 10 gives a 1 on the output, so this signal is high until the RC circuit charges up. Once that happens, the output of the XOR goes low. The nice thing about this is that you can adjust your on time by fiddling with R1 and C1. Larger RC, larger time on. You can use this to power a fet, although I would suggest a gate driver of some kind as logic gates have super low current output.