base on the bedini‘s version，except i Modify the 555 time output frequency to 60hz-120hz，and the test frequency is about 60hz。and the spark gap is made by the Silver piece，output resistance is 4.7K（bedini ‘s  diagram is 4.6K），when i use the electrode contact my hands ，i can feel a little electric shock。so the 4.7k should be adjust to a  larger value。