[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Awg formula, was "New formula for secondary resonant frequency"
Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
Paul, Kurt, All,
Here's another one:
awg = -8.62448720299999 * log(wd / 0.324557964, 2.718281829)
wd = wire diameter in inches
2.718281829 = base
Derived a couple years ago to replace my wire table lookup and eventually was
incorporated into JavaTC. If used in Excel, just take out the spaces and
replace wd with a cell reference for wire diameter in inches (Excel understands
Pretty close to Pauls, but I think a little better accuracy to nominal awg
dimensions. For example, 18 awg = .0403 inch or 1.0236 mm (nominal). Paul's
shows 17.5 awg. The above formula shows 17.99 awg. Just thought I'd throw it
out there for anyone interested.
> You can use
> awg = 1 + log(7.348e-3/wd)/0.115943
> and use this awg in the formula for fa above.
> Paul Nicholson,
> Manchester, UK.