The series or parallel resonant frequency of an inductor and a capacitor can be calculated using the following formula. A FLEXI-BOX is available with a dedicated PCB for this circuit and there is a selection of connectors. This is supplied as a kit, or as a ready built RF Trap
Where: f = Frequency
C = Capacitance
L = Inductance
The formula used in this calculator can be found among eight pages of useful formulas at:-
http://www.teicontrols.com/notes/CircuitTheoryEE411/CircuitTheory.pdf
This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX
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