Hi Tommyb
1. Is offset adjusted without a coil (or pulse set to 0)? Are we adjusting the offset so that the V at the output Pin 6 of the opamp is 0V? I know this is simple in theory but I am coming the learning curve.
That depends some are quite different in setting than others you will have to get the data sheet for that particular Op-Amp.
I set mine in this manner remove the coil test pin1 to pin 6 and pin 5 to pin 6 (LF357) I get 1.31v.
As for the delay I have set mine while presenting a gold coin to the coil there where I found the best result is where it was set it did take me quite a while as I also tried different frequencies. (Theory is good but at most time it don't work as well in practice).
If I recall I have seen that done before placing the cap and MOSFET by the coil but if I were you I'd first get it working then do all the mods that you like that way you will know if it's going better or not and you can always come back to your old configuration also only do one mod at a time (If possible)
All the best
Xavier
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Xavier