In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

Mark, 

Since bennettdan has also suspected insufficient drive coming from the 4422s, why don't we change the design to use IRL510 mosfets which can be driven at logic level ( 5v ) and can handle more than 5 amps continuous.
They cost less than USD 1 each.
If you put the TO-220 mosfets standing up, they actually use less PCB space than the DIPs.

What is the SR8 port used for?

John, 

How about extending the board to cater for 4 cylinder car engines as well.
This way, we can pool PCB resources and make more boards in one go for more people.

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