Free online calculator
Capacitive: — reactance falls as frequency rises, so a capacitor passes high frequencies.
Inductive: — reactance rises with frequency, so an inductor blocks them.
Formula
With the default values
Example Xc = 1.592 kΩ
Formula
With the default values
Example XL = 62.83 Ω
What you enter
LC resonanceAt that frequency the two reactances are equal — — and the branch currents cancel, so this parallel tank presents its highest impedance.
NE555 timerFully wired timing network — pins are grouped by function, not physical DIP order (see the 555 timer entry in Pinouts for the real pin layout). RST is…
RC filter— the −3 dB point, where the output has fallen to 70.7 % of the input. R in series, C to ground: C’s impedance falls as frequency rises, increasingly…
Sallen-Key filterA unity-gain second-order low-pass: sets where it turns, sets the shape. Q is peaking, not frequency — 0.707 is flat to the corner, below that the…
Time constantRC: — RL: — one time constant is how long the circuit takes to cover 63.2 % of the remaining gap to its final value.
Resistor ratio— or with "Invert" ticked.
Series / parallelSeries: