Generic calculators
- Round wire resistance calculator. (chemandy.com/calculators/round-wire-resistance-calculator.htm)
- PB Trace Width Calculator. (circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calculator)
- Flat Wire Inductor Calculator. (chemandy.com/calculators/flat-wire-inductor-calculator.htm)
- Tesla Coil calculator (www.classictesla.com/java/javatc/javatc.html)
- Nice Atmel Xmega baud rate calculator (www.dolman-wim.nl/xmega/tools/baudratecalculator/index.php)
Inductor calculators
- Calculate inductance, wire length, and other properties for toroidal inductors. Select from a list of core sizes/materials.
- Toroid inductance and flux density calculator (www.mantaro.com/resources/impedance_calculator.htm#toroid_inductance)
- Max flux density calculator (http://www.daycounter.com/Calculators/Max-Flux-Density-Calculator.phtml)
- Inductance of Circular Loop (technick.net/tools/inductance-calculator/circular-loop/)
Thermal calculators
- Plate Fin Heat Sink Calculator (www.myheatsinks.com/calculate/plate-fin-heat-sink-calculator)
- Air Flow Conversion Calculator. Convert between ft/min (LFM), m/s, miles/hr (MPH), ft3/min (CFM), m3/hr, and L/s (http://www.engineering.com/calculators/airflow.htm)
Software and other resources
- Nice command line based calculator. (speedcrunch.org)
- Inno Setup – Nice free windows program installer (www.jrsoftware.org/isinfo.php)
- Lots of images available for free download (www.pngimg.com)
- Free icon library (sourceforge.net/projects/openiconlibrary)
ESP8266 resources
- Espressif ESP8266 developer page (bbs.espressif.com/index.php)
- ESP8266 Community Forum (www.esp8266.com/index.php)
- Schematic symbols, PCB footprints, and 3D models for ESP8266 modules (github.com/jdunmire/kicad-ESP8266)