Electra - Electronics Toolkit

Electra is a fast, offline-first electronics reference tool built for engineers, students, hobbyists, and makers. Whether you're on the bench or in the field, Electra puts every essential calculation and reference at your fingertips - no internet connection required. CALCULATORS - Resistor Decoder: Read 4-band and 5-band color codes instantly - Ohm's Law: Solve for voltage, current, resistance, or power - LED Resistor: Calculate the correct current-limiting resistor - SMD Decoder: Decode capacitor and inductor SMD markings - Voltage Divider: Solve any variable in a resistor divider network - Battery Calc: Estimate capacity and discharge time - Resistor Network: Series and parallel combination solver - RC / LC Filter: Cutoff frequency calculator for RC and LC circuits - 555 Timer: Astable and monostable mode frequency calculator - Voltage Regulator: LM317 output voltage calculator REFERENCE - Symbol Guide: Common electronics schematic symbols - E-Series Values: Standard E6 / E12 / E24 / E96 component tables - Formula Sheet: Quick-access electronics formulas UTILITIES - Base Converter: Convert between Binary, Octal, Decimal, and Hex - Unit Converter: Instantly convert electronics unit prefixes (u, m, k, M, G) LEARN - Notes: Save tagged notes for formulas, tips, and component specs - History: Jump back to any recent calculation in one tap CUSTOMIZE - Light, Dark, or System theme - Adjustable decimal precision (1 to 6 places) Electra requires no account, collects no personal data, and works fully offline.