Chris Loper wrote:
> I realize that my assumption that I need an Hbridge is wrong.
> If I decide to pursue the relay / mosefet option,
You may not need a relay if you can find a big enough DPDT switch. A big
double knife switch should be fine for what you want. Those used to be more
common. It's the kind of item a old surplus place might have. The switch
will last longer if you aren't stepping on the accellerator when switching
directions. This is a go cart, so that sounds like a reasonable thing to
expect the user (you) to do.
Once the relay or switch is switched to a particular direction, you've got
the motor in series with the power supply and the power FET. Only a single
power FET is needed topologically, although multiple FETs may make it easier
to get to the desired current rating. The rest is just a little firmware in
a PIC with a A/D and PWM module.
What is the maximum motor current?
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