![]() ![]() I became obsessed, did some research, and found out that there were far more accurate formulae than those currently available on the web, but it appeared that those people who'd created the various calculators, were far more interested in creating calculators than actually providing something that gave accurate results. (We all have our foibles.) Several years ago, I was trying to do some calculations for some coils that didn't fit the usual coil geometry, and the numbers refused to work out. ![]() I confess to being a bit of an inductance evangelist. **broken link removed** which uses an empirical formula that I developed (error < 20 ppM), but doesn't include corrections for conductor size, so there is some loss of accuracy, but still not too bad. (my own calculator, so I'll admit to being biased), which uses the theoretically exact elliptic integral formula, plus conductor size corrections.ģ. which uses Lundin's very accurate empirical formula (error < 4 ppM), and includes corrections for conductor size.Ģ. Sadly, virtually everything I've found on the web is Wheeler's long coil formula. ![]()
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