Sam Gorman

Estimate linear regulator heat, chip temperature, current limit, efficiency, dropout margin, and heatsink needs.

Calculate Zener diode power dissipation in mW and W from the voltage across the diode and its current at one operating point.

Estimate diode drop, current with a resistor, or needed resistor size for a simple series diode circuit.

Estimate DC voltage after rectification, diode loss, capacitor ripple, and target voltage headroom from an AC source.

Find transformer turns ratio, voltage, coil turns, ideal current, apparent power, and reflected load with both ratio directions.

Calculate starting capacitor and inductor values, wiring order, and polarity for a passive two-way speaker crossover.

Calculate antenna cut lengths from frequency in MHz for verticals, dipoles, loops, end-fed wires, and J-pole starters.

Choose an AWG wire size from current, one-way length, voltage, voltage drop limit, material, and ampacity settings.

Find a DC fuse size from amps or watts, then check wire amp limit and optional fuse DC voltage rating.

Estimate DC output, ripple, capacitor size, diode reverse voltage, and bridge heat loss for a single-phase bridge rectifier.