Electronics Utils

Electronics calculators and maker tools. Resistor and capacitor codes, LED resistors, voltage dividers, 555 timer design, PCB layout, and a browser serial monitor; all running client-side.

555 Timer Calculator

Design astable and monostable 555 timer circuits. Get frequency, duty cycle, and pulse width from your resistor and capacitor values.

Capacitor Code Converter

Decode 3-digit capacitor codes like 104 into pF, nF, and µF values, and encode capacitance back to codes with tolerance letters.

LED Resistor Calculator

Calculate the series resistor for any LED from supply voltage, forward voltage, and current, with nearest standard values and power rating.

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Free online electrical calculator with V=IR formula.

PCB Designer

design simple PCB layouts online. Place components, route traces, and export Gerber files for circuit board manufacturing. Free...

Resistor Color

Decode resistor color bands (4, 5, or 6-band) to resistance values and convert resistance values back to color bands.

Serial Monitor

connect to Arduino, ESP32, or any serial device directly in your browser using the Web Serial API. Send commands, receive data,...

SMD Resistor Code

Decode 3-digit, 4-digit, and EIA-96 SMD resistor markings to resistance values, and find the marking for any resistance.

Voltage Divider

Solve resistive voltage dividers for output voltage or resistor values, with nearest E12/E24 standard resistor suggestions.

Wire Gauge

Look up wire properties by AWG, SWG, or metric gauge.

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