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Per I am looking at the hall sensor turning on when the magnetic is in front of it. Other then that it’s an open circuit.
This output can be amplified by the addition of a capacitor to create a resonance circuit.
QuotePer I am looking at the hall sensor turning on when the magnetic is in front of it. Other then that it’s an open circuit.I agree - but this also means that it 'short circuits' the output of the 555 ocsilator to ground when the magnet is in the 'Firing position' - just the opposite of what is required.
I wonder if the clue is that the Hall effect Device only triggers the 555.When I look at the one shot circuit shown on the 555 data sheet, it seems that the input is normally high, and the trigger pulse is a brief low. When the Hall effect device sees the magnet? Then the output goes from low to high for a fixed time period, which seems to be what is required to operate the sparking circuit. It is shown in the little graphs under the circuit drawing on the 555 data sheet. Does that help?But I am still not sure how the back half of the circuit works.MJM460