Free Electronics Tools
Handy calculators, references, and fun for your electronics projects
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🔢 Electronics Calculators
⚡ Ohm's Law Calculator
Calculate voltage, current, resistance, or power. Enter any two values.
💡 LED Resistor Calculator
Find the right resistor value for your LED circuit.
🌈 Resistor Color Code
Decode 4-band resistor colors or find colors for a value.
🔋 Capacitor Code Calculator
Convert between capacitor codes (like 104) and actual values.
📚 Quick Reference
⚡ Essential Electronics Values
Standard LED Voltages
Red: 1.8-2.2V
Green: 2.0-3.0V | Blue: 3.0-3.5V | White: 3.0-3.5VOhm's Law
V = I x R
P = V x I | R = V / I | I = V / RCommon Resistors
220, 330, 470, 1K
2.2K, 4.7K, 10K, 47K, 100KUSB Power
5V @ 500mA
USB 3.0: 900mA | USB-C PD: up to 100WArduino Pins
5V Logic, 40mA max
Total current: 200mA | ADC: 10-bit555 Timer
f = 1.44 / ((R1+2R2)C)
Duty: (R1+R2)/(R1+2R2)🎮 Retro Games
Take a break with these classic games - all running in your browser!
🐍 Snake
The classic Nokia game - eat dots, grow longer!
🏓 Pong
The original video game - beat the computer!
🧩 Breakout
Break all the bricks with your ball and paddle!
🔗 Helpful Resources
Learn Electronics with ProTechTrader
- Shop Electronics Kits - Everything you need to start learning
- Make: Electronics Guide - About our official component kits
- Video Tutorials - Watch and learn on our YouTube channel
- Customer Reviews - See what other makers are saying
- Contact Us - Questions? We're here to help!
The ProTechTrader Promise
As a small family-owned business, we care deeply about your projects. Whether you're a hobbyist, student, or professional, we promise to provide quality components and personal support. Thank you for choosing ProTechTrader for your electronic needs!
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