Sam Gorman

Find LM317 R1, R2, or output voltage, then check standard resistor choice, input headroom, power loss, and chip temperature.

Calculate non-inverting op amp gain, output voltage, dB gain, needed Rf or Rg, rail margin, load current, and bandwidth.

Calculate inverting op amp gain, output voltage, missing resistor, dB gain, bias-balance resistor, and a simple rail check.

Calculate ideal inverting or non-inverting op amp gain, dB gain, and an optional output voltage range check.

Calculate 555 one-shot pulse time, or find the needed resistor or capacitor, with a tolerance range for real parts.

Calculate ideal 555 astable frequency, period, high time, low time, and duty cycle from R1, R2, and capacitor C.

Calculate 555 astable frequency, period, duty cycle, monostable pulse width, and needed timing resistor or capacitor.

Find LC cutoff frequency, solve for L or C, and see tolerance range plus signal-side checks for low-pass or high-pass filters.

Calculate ideal LC resonant frequency, or find the inductance or capacitance needed for a target frequency.

Calculate RLC resonant frequency, Q factor, bandwidth, half-power points, and optional impedance at a test frequency.