Well I don't think we can avoid using the toroid.. the schematic I posted is an alternative for the circuit that drives the toroid.
The circuit Bob released to the public uses 3 independent pulse generators(556), and I heard that with that circuit the production is not constant.
So I assume the reason for that it is because the 3 frequencies are not in sync with each other.
The circuit I posted will keep the 3 frequecies in sync.
the divide by 10 are cd4017, the flipflops are cd4013, the main clock from the 555 needs to be about 428 khz
I spoke with Stevie today, and he recomended using a CD4060 to replace the 555 and cd4013.
The reason for the cd4017 is to provide a 10% duty cycle and to control how to sync the frequencies.