See Bob Boyce's Stanley Meyer implementation
Large Complex HH0 Waveform
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There are two primary frequencies that produce the best results. They are: 14,372 Hz and 43,430 Hz. The former is about 50% more efficient, but it seems that just about any frequency between 9 KHz and 143,762 KHz works quite well. (1) This is because the nature of the wave form ( a spike ) is rich in harmonics and one of them is bound to be close to one of the two primary frequencies.
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