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Think coil wire size, coil L/Rd and amplifier response effect the accuracy of he charted decay. Think their TC should be at least half(probably less)the desired target TC? To record a .1us TC, wire size AWG34 or less, amplifier response about 3MHz and coil L/Rd about .05us(circuit resonance=6MHz)?
Playing with spice. For a .1us TC target, coil L/Rd=.1us and SRF=2.4MHz would be enough.
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