Learn Electronics
The Hands-On Way
Interactive calculators and references for makers, hobbyists, and anyone curious about how circuits work.
→ LED Calculator
// Tools & References
Ohm's Law Calculator
Calculate voltage, current, resistance, and power. Enter any two values, get the rest.
V = I × R
Resistor Color Codes
Decode those tiny colored bands. Works for 4, 5, and 6-band resistors.
Brown-Black-Red = 1kΩ
LED Resistor Calculator
Find the right resistor for your LED circuit. Supports common LED types and voltages.
R = (Vs - Vf) / I
Capacitor Codes
Decode ceramic capacitor markings. Enter 3-digit code or find code from value.
104 = 100nF = 0.1µF
Binary/Hex Converter
Convert between bases with interactive bit visualization and bitwise operations.
42 = 0x2A = 0b101010
ASCII Reference
Searchable, sortable ASCII table with decimal, hex, binary, and descriptions.
65 = 0x41 = 'A'
// Quick Reference
Ohm's Law
V = I × R
I = V / R
R = V / I
Power
P = V × I
P = I² × R
P = V² / R
Series Resistors
Rtotal = R₁ + R₂ + R₃...
Parallel Resistors
1/Rt = 1/R₁ + 1/R₂...