Tronic H-bridge

[RafBR]

I am wondering to make a mod on this h-bridge to be able to use irfz44 mosfets. A way to deliver a little more voltage to the gate. Maybe an external power supply.
As I am making one optocoupler powered by the car battery (which is the same that powers the motors) maybe the same power supply that deliver power for the optocoupler could deliver more power for the gates.

[RafBR]

Acording to this document, delivering more volts to the 74hc08 chip it outputs more volts aswell.
And 5.5v should be enough to properly open the irfz44n gate. Or not?

I will now make some measurements and post it latter.

My regards!

Edit: I just measured the h-bridge gates powered by AMC board. The results was 4.8 to 4.9 volts to the gates which I think is higher than I would tought
Anyway if its good for IRL may be a little low for the IRF, right?
The most weird thing I found is the fact that the datasheets show Voltage Thresholds of 1-2 volts and 2-4 volts for the IRL and IRF respectivelly which is lower than what the 74hc08 delivers.

[RafBR]

http://forum.arduino.cc/index.php?topic=74718.0;wap2
reading this article I found that the irfz44 need 10v to fully open its gate
So now I am really thinking of making it. The IRF3205 needs 10v aswell. So it could be used too.
As the 74hc08 doesnt handle 10v I think I will get its output, optocouple it and amplify the voltage at same time.

[RafBR]

http://www.youtube.com/watch?v=PqSEGMeL4NI
I ran this test with an optocoupler to see if it was able to "send analog information" (variable voltage) and for my surprise it worked
So I think its possible to handle the output of 74hc08, doubling its output voltage when optocoupling.

I think I am doing this research because IRFZ44 is way less expensive here (and more available), and I should optocouple it anyway

My regards!

[RafBR]

My Dsmhb is back!
Was (like always) one cold soldering in one resistor. I have another problem with she (the board) sometimes but I slap her and she back to work. Must be another could soldering.
Anyway, I like this board so much that I decided to make another one. This time I will do it better.

Now I am using the IRLZ24n. Yes, 24n I did not found the 44n to buy.

[RafBR]

If I wish to try one DC motor with about 30A continous and this h-bridge should I replace this 1N5818 Schottky Barrier Rectifier by one higher rated?
On its Datasheet says "Peak Forward Surge Current 25A"