Woohaa, it's certainly not something i would try on a breadboard... Anyways, i would suggest to use something else than this opamp to drive your mosfet, use mosfet driver TC1427 or whatever else. Isolate your logic ground and your power ground, don't leave any pin floating even if they're set as output, and plah plah), keep your coil away from your pic.
Breadboard is nothing else than a big antenna, and of course this is one of your main problem.
Not sure if a Cordless battery have enough guts...
You could try to disable the brown out detect.. but i'm not a fan of disabling this feature...
100 uF at the input of the regulator... increase it as much as you can and see if this improve results.
100uF at it's output is almost pointless, i would suggest to decrease the value to say 10uF tantalum and also add a 0.1uF at the output.
Try something else... use another voltage source for your PIC, wall wart, 9V battery whatever else, and leave the Cordless tool battery for your Coil.
See how better/worst it is with the above suggestion and post your results.
Last edited by mister_e; - 3rd January 2008 at 07:43.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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