- A/d - size of antenna aperture (as an area or as an diameter)
- λ/f - wavelength or frequency
- e - aperture efficiency (as a value [0..1] or percent)
- G - antenna gain (as a dimensionless quantity or as dBi value)

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.

[1.10 2019-01-13][s]