H bridge

please explain how I connect the mosfet!

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Sorry but if you need to ask such a question then you really shouldn't be building it.

It's an SMT device, Wikipedia that if you don't know.

The pins marked: D connect to the Drain, S to the Source and G to the Gate, what else would it be, it's clearly indicated on the diagram?

To make sure the resistance is low enough you need to use all the pins.

As I told you before: DO NOT USE THE COMPONENTS I PUT ON THE DIAGRAM. I wish I hadn't included the part numbers.

precizē only to know the relationship of the circuit design! with the integrated! I can not imagine the links!

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I'll give you a clue: it's drawn upside down.

Thank you! was a good light! : P

can understand turning the scheme on the contrary!



What I realized is that to do a shunt on pins 5,6 and 7;
and pins 1,2 and 3 also have to do a shunt

Hero999 said:

Originally Posted by Mike odom
AND it's running a motor, not a resistive load.
It's standard practise on schematics to replace the device being driven with RL.


It might not be driving a motor, it could be a latching relay coil or even a speaker.

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yes but then they operate differently.
Resistive loads place nice. inductors and capacitors don't.

Hero999 said:

The only thing I would change is to put a 1K between each 7204 gate and the corresponding drains.
Why do you suggest that?

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Because the 12V is too close to the absolute max ratings. I might even make it a 2K. And there's just something creepy about hooking a gate (all exposed like) to a motor winding, or any exposed I/O pin for that matter. Since these are FETs, do you think someone should tell him about ESD and proper handling and all that?

I thought the fact that the FETs were smt packages was a plus, but somehow forgot the level of the project. You are absolutely right, moonstreat needs to pick a TO-92 or even a TO-220 package.

moonstreat: add TO-220 to your parametric search parameters.

Mike odom said:

Because the 12V is too close to the absolute max ratings. I might even make it a 2K.

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That makes sense.

I'd choose some MOSFETs with a gate voltage rating of 20V.

And there's just something creepy about hooking a gate (all exposed like) to a motor winding, or any exposed I/O pin for that matter. Since these are FETs, do you think someone should tell him about ESD and proper handling and all that?

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The internal MOSFET diodes should provide some protection but I'd add some protection diodes if I had any doubts.

I changed the circuit to include more sensible MOSFETs.

I only did this because I need it to post in another thread and I decided to modify it.

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