Engineering Blog

Learn how to size a BLDC motor using Kv rating, torque constant Kt, and efficiency calculations. Includes worked examples for drone, robot, and vehicle motor selection.

Learn how to convert power levels across different impedances and units with precision using our comprehensive dBm Power Converter tool.

Design EMI filters for conducted emissions compliance. Covers LC filter topology selection, cutoff frequency calculation, common-mode vs differential-mode filtering, and CISPR 32 limits.

Learn how to read and use a Smith Chart for impedance matching. Covers impedance circles, admittance overlays, matching network design, and worked examples with specific impedance values.

Master BJT transistor biasing with our comprehensive calculator and learn how to set the perfect DC operating point for your analog circuits.

Learn how to calculate and design 4-20 mA sensor transmitters with precision, covering voltage, resistance, and critical design considerations.

Master op-amp gain and bandwidth calculations with practical insights, real-world examples, and common design pitfalls to watch out for.

Master data rate unit conversions with our comprehensive guide. Learn how to translate between bps, bytes, and network speeds effortlessly.

Master BJT transistor switch design with a powerful calculator. Learn critical design parameters, avoid common mistakes, and calculate key performance metrics.

Learn how to accurately calculate PT100/PT1000 sensor resistance, understand temperature sensitivity, and avoid common measurement pitfalls.

Master LDO linear regulator thermal design with our dropout voltage calculator — prevent power supply failures before they happen.

Explore Ohm's Law calculations with precision. Learn how to calculate voltage, current, resistance, and power with our comprehensive engineering tool.

Master LC circuit analysis with our comprehensive resonance calculator. Learn frequency, Q factor, and impedance calculations for RF and electronics design.

Master ESD diode selection with expert insights: learn how to calculate peak current, power dissipation, and protect your sensitive electronics

Master passive filter design with precision: Learn how to calculate RC and LC filter components for optimal signal processing performance.

Master current mirror design with our comprehensive calculator. Learn techniques, avoid common pitfalls, and create precise current sources for analog.

Master motor thermal design with our comprehensive heat dissipation calculator and expert insights into preventing catastrophic motor failures

Master op-amp closed-loop bandwidth calculations with practical insights and real-world performance analysis techniques for electronics design

Master RTD temperature measurement techniques with PT100/PT1000 sensors, including calibration, resistance-to-temperature conversion, and critical engineering.

Learn how to calculate precise CAN bus timing parameters for reliable embedded communication across different microcontroller clock speeds and baud rates.

Learn how to calculate transformer turns ratio, secondary current, and real power delivery with worked examples. Free online calculator included.

Learn Ziegler-Nichols PID tuning using process gain, dead time & time constant. Worked example with real motor control values. Free online calculator.

Learn how to convert torque units between N·m, lb-ft, oz-in, kg-cm & more. Worked examples for servo, stepper, and automotive motor applications.

Learn how to decode 3-digit capacitor codes into pF, nF, and µF values. Worked examples, the math behind the system, and a free online calculator.

Learn how capacitive proximity sensors work, calculate capacitance & sensitivity from plate area, gap, and permittivity using our free calculator.

Learn to calculate conduction and switching losses in MOSFET H-bridge motor drivers. Worked example with real numbers using our power dissipation calculator.

Q factor = f₀ / BW — higher Q means a narrower, more surgical EQ cut or boost. How Q, bandwidth, and gain interact in peaking, shelving, and notch filters, with worked examples.

Calculate Ethernet cable attenuation, max length, and pass/fail status for Cat5e–Cat8 runs. Includes worked examples and real engineering numbers.

Learn how to convert frequency to wavelength in free space and PCB substrates. Worked examples for WiFi, radar, and antenna design using our calculator.

Learn how to design small loop antennas with real examples. Calculate radiation resistance, gain, loss resistance, and bandwidth for HF loops.

Learn how to calculate NTC thermistor cold resistance, energy absorption, and time constant to limit inrush current in capacitive power supplies.

Learn how to calculate AM modulation index, sideband frequencies, bandwidth, and power efficiency with real worked examples for RF engineers.

Learn how to design PCB layer stacks for controlled impedance. Covers microstrip, stripline, differential pairs, and CPWG with Hammerstad-Jensen formulas.

The rftools Python package gives you programmatic access to 203 RF and electronics calculators from rftools.io — with a typed API, CLI, batch mode, and async.

Learn how audio transformer turns ratio links impedance, voltage, and current. Worked examples and formulas for matching audio sources to loads.

Calculate the correct LED current limiting resistor for any supply voltage and LED color. Includes worked examples, E24 selection, and power dissipation.

Estimate battery runtime under motor load. Covers LiPo, NiMH, lead-acid packs with drive efficiency, depth of discharge, and real worked examples.

A practical walkthrough of the PDN Impedance Analyzer: modeling VRM impedance, plane-pair cavity resonances, and using the genetic algorithm to select.

How to use the Radar Detection Simulator to compute Pd vs range for all five Swerling target models, add ITU-R P.838 rain attenuation, run Monte Carlo to.

A complete walkthrough of the RF Cascade Budget Analyzer: setting up a 5-stage LNA + mixer + IF chain, computing cascaded NF, gain, IIP3, and P1dB, then.

How to use the Satellite Link Budget Analyzer to compute a complete Ka-band downlink budget using ITU-R P.618 rain attenuation, P.676 gaseous absorption, and.

Learn how VSWR relates to return loss, reflection coefficient & mismatch loss. Includes worked examples and an online calculator for RF engineers.

Calculate cable shield effectiveness and transfer impedance from DC resistance, length, and frequency. Includes worked examples for EMC engineers.

Calculate chassis resonant frequencies from enclosure dimensions. Avoid EMC failures by predicting TE₁₀₁ and TE₁₁₀ cavity modes in metal housings.

Calculate series & parallel resistor, capacitor & inductor totals plus voltage divider ratios. Worked examples and formulas for everyday circuit design.

Size a heatsink in 3 steps: calculate required thermal resistance θ_SA from power dissipation and junction temperature, choose a heatsink rated below that value, then verify the full thermal path. Includes worked example and free calculator.

A 1.0 V / 30 A FPGA power rail needs flat impedance from 100 kHz to 1 GHz. Cavity resonances between the power and ground planes create impedance spikes that.

A practical walkthrough of using the Radar Detection Monte Carlo simulator to evaluate a 10 GHz X-band weather radar — comparing Swerling models, quantifying.

A step-by-step walkthrough of designing a 6-stage Ku-band receiver using the RF Cascade Budget Analyzer — optimizing the LNA/filter sequence for system NF.

A practical walkthrough of using the Satellite Link Budget tool to design a Ku-band VSAT link — computing rain attenuation with ITU-R P.618, validating margin.

rftools.io now ships an MCP server that lets AI assistants like Claude Desktop, Cursor, and Claude Code run any of our 197 RF & electronics calculators.

Learn how to size solar panels, batteries, and charge controllers for off-grid systems. Worked example with real numbers using our Solar Panel Sizing.

How to choose decoupling capacitor values: self-resonant frequency (SRF) sets the effective bypass range — 100 nF works at ~5 MHz, 10 nF at ~50 MHz, 1 nF at ~500 MHz. ESR and ESL explained.

Learn how to calculate EIRP and ERP for regulatory compliance. Worked examples for FCC Part 15, ETSI 2.4 GHz, and ISM 433 MHz with margin analysis.

A hardware startup's SBC fails FCC Part 15 Class B pre-compliance on the first scan. Follow the analysis in the EMI Radiated Emissions Estimator to identify.

A PCB designer routes a 10 Gbps SerDes lane across a 20 cm FR-4 trace with two connectors. Learn how to use S-parameter data and an eye diagram simulation to.

A step-by-step guide to running an FDTD simulation of a through-via transition in FR-4. Covers how to set up the simulation, interpret S11/S21 results.

A practical walkthrough of matching a 50 Ω source to a 200 Ω LNA input across the 800–1200 MHz cellular band. Learn why L-networks fail on bandwidth, how Pi.

Designing a flyback transformer by hand means picking one core from hundreds and hoping your intuition about the efficiency-versus-size trade-off is close. The.

Learn how to calculate pressure sensor bridge output voltage from excitation, sensitivity, and applied pressure. Includes worked examples and formulas.

A 5th-order Chebyshev low-pass filter at 100 MHz looks perfect in simulation. But with 5% capacitors and inductors, Monte Carlo analysis reveals a yield.

A practical walkthrough of the S-parameter analysis pipeline: viewing raw VNA data, identifying connector response, applying time gating to isolate a PCB trace.

A step-by-step walkthrough of using the SMPS Control Loop Stability Analyzer to verify phase margin, gain margin, and crossover frequency for a 12V→5V buck.

Learn to calculate junction temperature using thermal resistance networks. Worked examples with θJC, θCS, θSA for heatsink design and thermal margin analysis.

A radio amateur designing a 5-element Yagi for 144 MHz EME and tropo scatter work uses NEC2 simulation to verify gain, front-to-back ratio, and feedpoint.

A practical guide to designing audio amplifier stages: calculating power output, matching speaker impedance, managing noise floor, and choosing between Class.

Complete guide to controlling DC motors with PWM: selecting the right H-bridge driver, sizing the MOSFET, and closing the loop with an encoder.

Master decibels for RF and audio engineering. Understand the difference between dB (ratio), dBm (power relative to 1 mW), dBV (voltage), dBi (antenna gain).

A practical guide to EMC pre-compliance testing, PCB layout for low emissions, and common failure modes that cause first-attempt failures at the test house.

How to design the amplifier, filter, and ADC interface between a sensor and a microcontroller. Covers RTDs, thermocouples, load cells, current shunts, and.

How to choose and design active filters. Compares Butterworth, Chebyshev, and Bessel responses with practical examples for signal processing and RF.

How to design a synchronous buck converter from scratch. Calculates duty cycle, inductor value, output capacitor, and estimates efficiency with worked examples.

How to calculate PCB trace width for a given current. Compares IPC-2221 and IPC-2152 standards, explains temperature rise, and covers external vs internal.

Learn how to perform an RF link budget analysis from scratch. Covers free-space path loss, antenna gain, cable losses, receiver sensitivity, and link margin.

A practical guide to designing controlled-impedance microstrip traces on PCBs. Covers the Hammerstad-Jensen equations, material selection, manufacturing.