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Simple h-bridge design

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audioguru said:
Make a good video of the smoke.

As long as my stamp doesn't smoke :>

Thanks

Btw is it a good idea to directly connect the stamp VSS to the same ground as the H-Bridge? Should I use an opto-isolator?
 
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Ok after some tests, I notice one problem. With either the LED or motor about every 3 to 4 seconds the LED dims a little, or the motors slows a little then speeds back up. This is with a simple test that just sets A and C High. Can anyone suggest what a possible way to fix this would be, or the cause?
 
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