http://www.creepage.com/ creepage and clearance calculator
https://www.ti.com/download/kbase/volt/volt_div3.htm Voltage Divider Calculator (E24 and E96 resistors)
https://flaviutamas.com/calc/electronics/dc-dc/boost Boost converter calculator
https://groups.io/g/LTspice LTSpice Discussion Group, the encyclopedia of LTSpice
https://fscdn.rohm.com/en/products/databook/applinote/common/how_to_use_ltspice_models_an-e.pdf How to Use LTspice® Models----- Rohm Semiconductor
https://youtu.be/ajcYYwoHF0g -------- Adding Third-Party Models to LTspice IV
https://wcalc.sourceforge.net/cgi-wcalc.html -------- Wcalc is a tool for the analysis and synthesis of transmission line structures and related components.
https://www.digikey.com.au/en/resources/conversion-calculators/conversion-calculator-capacitor-safety-discharge ------------Capacitor Safety Discharge Calculator
https://tmi.yokogawa.com/au/solutions/products/power-analyzers/power-measurement-application-software/power-consumption-measuring-software/ ----- Yokogawa Power Consumption Measuring Software
https://www.monolithicpower.com/en/support/industry-information.html https://www.monolithicpower.com/en/support/webinars.html ---------- MPS resources
https://pages.rohm.com/rs/247-PYD-578/images/TWHB-03e.pdf ---- Rohm Buck layout guide
https://www.falstad.com/circuit/circuitjs.html ----- online circuit simulator