UD5 Toolkit
dBm to Watts Converter - Online RF Power Unit Calculator
Convert between dBm, milliwatts, and watts. Simple calculator for RF engineers and WiFi signal analysis. Instant local calculation.
Electronics Tools - Circuit Design
20+ toolsCrystal Load Capacitance Calculator - Online Pierce Oscillator Tool
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
Voltage Divider Calculator - Online Two Resistor Output Tool
Calculate output voltage from a two-resistor voltage divider. Enter input voltage and resistances to see Vout. Includes circuit schematic. No data sent.
Resistors in Parallel Calculator - Online Multiple Branch Tool
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Ohm's Law Calculator - Online Voltage Current Resistance Power
Enter any two values (voltage, current, resistance, power) and compute the others. Visual triangle helper and formula display. Instant local calculation.
Soldering Temperature Guide – Online Component & Tip Size
Select component type and solder to see recommended iron temperature and tip shape. Avoid cold joints.
Zener Diode Regulator Calculator - Online Series Resistor & Power
Calculate the series resistor and power dissipation for a zener diode voltage regulator. Input voltage, output voltage, load current. Local only.
Series & Parallel Resistor Network Solver
Build a combination resistor network by adding series/parallel groups and get total resistance. Visual circuit.
Capacitor Code Calculator - Online 3-Digit to Picofarad & Nanofarad
Convert 3-digit capacitor codes (like 104, 222) to capacitance value in pF, nF, µF. Also converts back. Useful for reading tiny ceramic capacitors.
LED Series Resistor Calculator - Online Current Limiting Tool
Calculate the correct series resistor for an LED based on supply voltage, LED forward voltage, and desired current. Circuit diagram shown. Local only.
Antenna Length Calculator - Online 1/4 Wave & Dipole Tool
Calculate antenna element lengths for a given frequency (or vice versa). Supports 1/4 wave, 1/2 wave, dipole. Useful for ham radio. Local only.
Speaker Wire Gauge Calculator - Online Length & Impedance Guide
Find the correct wire gauge for speaker cables based on length and speaker impedance to avoid signal loss. Quick audio reference. Local.
Battery Life Calculator - Online Device Runtime Estimator
Estimate how long a battery will last given capacity (mAh/Wh) and load current. Also computes backup time for power banks. Quick and local.
LED Strip Power Calculator - Online PSU & Controller Sizing
Calculate power supply and controller requirements for any length of LED strip (5050, 2835, WS2812B). Prevents overloading. Local only.
SMD Resistor Code Decoder - Online 3-Digit & EIA-96 Markings
Decode SMD resistor markings (3-digit, 4-digit, EIA-96) to resistance value. Enter code and get ohms instantly. Handy for PCB repair.
Transistor Biasing Calculator - Online Fixed & Voltage Divider
Calculate resistor values for transistor fixed bias or voltage divider configuration. Quick quiescent point analysis.
USB Pinout Reference - Online Connector Wiring Guide
Reference diagrams for USB‑A, USB‑C, micro‑USB pinouts. See wire colors and signal descriptions. Hardware hacking helper.
Voltage Divider Calculator - Online Electronics Resistor Tool
Calculate the output voltage and resistor values for a voltage divider circuit. Includes schematic. Handy for electronics hobbyists and engineers.
Resistor Color Code Calculator - Online Band to Value
Select color bands to decode a resistor's value, tolerance, and temperature coefficient. Essential for anyone working with electronics hardware.
Battery Series/Parallel Calculator - Online Voltage & Capacity
Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.