LED & Circuit Design
LED resistors, 555 timers, series strings, arrays, current limiting and op-amp drivers — the everyday building blocks of LED and signal circuits. Seven complete tools, all live.
01
LED Resistor Calculator
Series resistor for a single LED.
Live 02555 Timer — Astable
Frequency, period, duty of a blinker.
Live 03555 Timer — Monostable
One-shot pulse width t = 1.1·R·C.
Live 04LED Series Resistor
Resistor for a series string of LEDs.
Live 05LED Array Calculator
Per-string resistor and total power.
Live 06Current Limiter
Series resistor to cap a load current.
Live 07Op-Amp Gain — LED Driver
Gain-set LED driver with limiting R.
Live