Engineer's Toolkit

// small, fast calculators for test-rig and DAQ work — no signup, no ads, no calls home

Torque Converter

Enter a value in any unit; the others update.

Angular Velocity

Rotational speed in mechanical and signal-processing units.
Period (T)— @ r = 100 mm tip speed—

Strain-Gauge Bridge

Wheatstone bridge output for a given strain and configuration. Assumes identical gauges; small-strain approximation.
Vout— mV / V— Sensitivity—
Vout = (k/4) × GF × ε × Vex   (k = 1, 2, or 4)

ADC Resolution & SNR

LSB size, ideal signal-to-noise ratio (6.02·N + 1.76 dB), and ENOB for a given bit depth.
LSB— Ideal SNR— Quant. noise— ENOB (from SINAD)—

Sampling & Nyquist

Max usable input frequency and a sensible anti-alias filter cutoff for a given sample rate.
Nyquist (fs/2)— Suggested AA fc— Usable bandwidth— Sample period—
Cutoff chosen so Butterworth attenuation at Nyquist exceeds stopband target.

Cantilever Beam Stress

Tip load on a rectangular cantilever. Useful for sizing strain gauges and load cells.
Max bending stress σ— Surface strain ε— Tip deflection δ— Moment of inertia I—
σ = 6FL/bh²,  ε = σ/E,  δ = FL³/3EI

Mobile Vibration Analyzer  →

Standalone page. Uses your phone's accelerometer to plot a live time-domain trace, FFT spectrum and waterfall. Best opened on a phone.
InputsDeviceMotion · 3-axis FFT256-pt Hann Plotstime + spec + waterfall
Try it on a fan, washing machine on spin, electric toothbrush, or your car's dashboard.

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