Editing Online references, utilities, calculators etc.

==Cable tools==
[http://www.epanorama.net/index.php?index=calc_cable Cable resistance/rating calculator]
[http://en.wikipedia.org/wiki/American_wire_gauge#Table_of_AWG_wire_sizes Wire sizes] AWG, mm2 sizes, resistances etc.

== Ohm's Law Tools ==

[http://www.rcrowley.com/eirp.htm Voltage - Current - Resistance - Power Calculator] 

[http://www.rcrowley.com/rfc.htm Resistance - Frequency - Capacitance Calculator] 

[http://www.rcrowley.com/cfl.htm Capacitance - Frequency - Inductance Calculator] 

[http://www.rcrowley.com/dbm.htm dBm - Voltage - Impedance Calculator] 

[http://www.rcrowley.com/zenerreg.htm Zener Voltage Regulator Calculator]  

== PCB tools==

[http://www.desmith.net/NMdS/Electronics/TraceWidth.html PCB Track width calculator] Maximum current, temperature rise above ambient, cross-section etc.

[https://isodesign.isola-group.com isoStack] Tool for designing layer stackups featuring Isola products, Impedance calculator for SE and DIFF microstrip/stripline configurations

[https://www.multi-circuit-boards.eu/en/pcb-design-aid/impedance-calculation.html Impedance Calculator] Tool for calculating the impedance of high frequency printed circuit boards. Supported methods: Surface Microstrip, Coated Microstrip, Edge-Coupled Surface Microstrip and Edge-Coupled Stripline (symmetrical)

[https://saturnpcb.com/pcb_toolkit/ saturn pcb toolkit] is a very complete calculator for via, traces, diff pairs impedance, resistance, current capacity etc
[https://kingfordpcb.com/] PCBA and PCB manufacturer

== Capacitor Code Calculator ==

[https://www.dyethin.com/SmallTool/smd_capacitor SMD Capacitor Code Calculator] Quickly convert capacitance marking codes to capacity and tolerances.

== Resistance Calculators ==
[http://www.eevblog.com/files/ResCAD20.zip Resistor CAD 2.0 by Terry Harris from Vader Systems]

[http://www.qsl.net/in3otd/parallr.html IN3OTD series and parallel resistance calculator]

[http://koti.kapsi.fi/jahonen/Electronics/ResOptimizer/ ResOptimzer (WIN32) from EEVBlog forum member jahonen ]

[http://sparks.gogo.co.nz/resistor_paralleler.html Javascript resistor network solver from EEVBlog forum member sleemanj]

[http://jansson.us/resistors.html resistor calculator from jansson ]

==RF Design utilities==

[http://www.aade.com/filter.htm AADE Filter Design V4.5] Design and analyse passive filters in both the frequency and time domain.

[http://www.janson-soft.de/amateurfunk/rfsim99/rfsim99.exe RFSim99 by Stewart Hyde] RF simulation with S-parameters. Not only for filters.

RFSim99 is freeware software that helps with impedance matching and can simulate RF circuits. Plots Amplitude and phase response, different display styles including Smith chart. Uses one and two-port Scattering parameters. You can for example import an S-parameter file of your filter from your network analyser and have the software calculate matching. Requires Windows 95, 98, NT or 2000 (WinXP virtual machine runs it just fine)

[http://www.everythingrf.com/rf-calculators RF Calculators] A series of RF Calculators optimized for Desktops, Tablets and Mobiles - Attenuator Calculators, Unit Conversions, Skin Depth Calculator, Link Budget Calculator and many more.

[http://www.everythingrf.com/rf-calculators/microstrip-patch-antenna-calculator Microstrip Patch Antenna Calculator] This calculator calculates the length and width of a patch antenna based on the frequency, dielectric constant of the dielectric and the height of the thickness of the patch antenna substrate.

[http://www.everythingrf.com/rf-calculators/skin-depth-calculator Skin Depth Calculator] Enter the frequency and the characteristics of the material to calculate the skin depth.

[https://isodesign.isola-group.com/ Power Handling & Impedance Calculator] for PCB tracks on Isola dielectic materials, insertion losses