Electrical

Calculate voltage gain in dB from input and output voltage, or solve a missing voltage from a known dB gain.

Calculate required sine-wave op amp slew rate, maximum frequency, or maximum output voltage from Vpk, Vpp, or Vrms.

Estimate an op-amp’s closed-loop -3 dB bandwidth from GBW and gain or resistors, using noise gain for inverting stages.

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.