Frequently Asked Questions
What does 104 mean on a capacitor?
The first two digits are the value and the third is the number of zeros, in picofarads: 10 + 0000 = 100,000 pF = 100 nF = 0.1 µF.
What does the letter after the code mean?
It is the tolerance: J = ±5%, K = ±10%, M = ±20%.
What is the RC time constant?
τ = R × C is the time a capacitor takes to charge to about 63% through a resistor. After 5τ it is practically full, which is how simple delays and button debounce circuits work.
Educational use only. Results are estimates from standard formulas and typical values, provided "as is" without warranty. Always check your part's datasheet and follow safety precautions. Arduino, ESP32, ESP8266 and Raspberry Pi are trademarks of their respective owners; TechsPassion is not affiliated with them. See the full disclaimer.