Electronics

Foundation of Radio & Electromagnetic Science

Crystal Set Coil Winder

Calculate exact copper wire turns and inductance for DIY crystal radios.

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Resistor Color Code Decoder

Decode 4-band and 5-band resistor values instantly. Visual interface based on the 1920s RMA color standard.

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LED Resistor Calculator

Calculate the perfect series resistor to protect your LEDs. Prevent burnout and extend battery life with precise Ohm's Law calculations.

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Ohm's Law Triangle

Calculate Voltage, Current, and Resistance using our interactive triangle. The fundamental tool for electronics DIY.

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Battery Life Calculator

Estimate battery runtime from mAh capacity, current load, and efficiency. Device presets, reverse calculator, log-scale discharge timeline, device current draw table, and battery type guide.

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In short: These tools are for education and curiosity only. Always verify information independently and consult professionals before making important decisions.

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