- enter the number of turns n, the coil diameter D and the wire diameter d, and the calculator will compute an estimated value of inductance L
- enter the number of turns n, the wire diameter d and the inductance L, and the calculator will compute an estimated value of coil diameter D
- enter the coil diameter D, the wire diameter d and the inductance L, and the calculator will compute an estimated number of turns n

There is a good practise to wind 10% more turns than calculated. Any corrections will then be easier.

resistors in parallel

capacitors in series

inductances in parallel

LC resonance circuit

bandspread capacitors circuit

single-layer air-cored coil

circular loop coil

square loop coil

frequency,wavelength,period

three-digit capacitor markings

resistor codes (4 bands)

resistor codes (5 bands)

choke/inductor color codes

555 astable

555 monostable

match standard Ex value

combine standard E6, E12 & E24 values

LM317 voltage regulator

dBm ⇆ mW converter

mm ⇆ in converter

resistance of a wire

Ohm's law

dropping resistor for 'P' tubes

dropping capacitor for 'P' tubes

dropping resistor for 'U' tubes

dropping capacitor for 'U' tubes

line-of-sight

dropping resistor for LEDs

Y-Δ transform

Y-Δ transform (capacitances)

parabolic antenna gain

AWG converter

[ekalk]© Sławek Wernikowski, 2012-2018. Set of useful interactive calculators for electronics constructors and hams.

All suggestions and comments are always welcome.

[3.40 2020-08-22][]