welcome to the diverse world of electronic hardware!there's so many different ways of doing a job, and there is often not a 'correct way' of doing something, there are often different solutions, and most of us will naturally prefer one particular method, and even sometimes be scornful of another way we see.
marcbarker said:To learn enough knowledge to design hardware is a bit of a slog at first, but it's rewarding along the way
How would the low-power circuit actually be completed though?
Since the shared emitter essentially means a shared ground, the microprocessor's parallel port bit would be connected to the battery's negative terminal, which doesn't sound like a completed circuit to me... am I missing something?
. I'm still not clear on how to prevent the H-B current flowing through the microprocessor's GND...
Other than that, sorry, it won't work.
Mr RB said:Hi, Pololu make a real cheap little 2 motor hbridge controller that just needs 3 pins to control each motor, (2 pins if you dont pwm) check down the page for;
TB6612FNG Dual Motor Driver Carrier
marcbarker said:Great book is the 'Horowitz and Hill', it's usually in libraries.
the threshold point in an IV-curve is when the mosfet crosses over from weak inversion to saturation inversion. In weak inversion the dependence between current and vgs is exponential, while in saturation inversion it is only squared.
solis365 said:I think a pretty popular MOSFET for this purpose is the IRF510 type.
solis365 said:However you usually want to drive the gates on those with +5V, and your uC is +3.3V, which will be on the "edge" of being fully on (if its not fully on it will be a "higher resistance" as you explained above. this will cause it to dissipate more power and thus get hot and be less efficient. depending on how much current your motor needs you could burn out the transistor if it is not fully on.)
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