🔌 Electrónica
Decodificadores de resistencias, calculadoras LED, herramientas de condensadores y más
Decodifica códigos de colores de resistencias de 4 y 5 bandas al instante.
Abrir herramienta →Calcula la resistencia necesaria para un circuito LED.
Abrir herramienta →Decodifica códigos de condensadores cerámicos de 3 dígitos (ej. 104 = 100nF).
Abrir herramienta →Calcula el voltaje de salida de un divisor resistivo. Ingresa Vin, R1, R2.
Abrir herramienta →Calcula frecuencia, ciclo de trabajo y temporización para circuitos de temporizador 555.
Abrir herramienta →Calcula el ancho mínimo de pista PCB para una corriente dada, usando IPC-2221.
Abrir herramienta →Tabla de referencia AWG con diámetro, área, resistencia y corriente máxima.
Abrir herramienta →Calcula la constante de tiempo, carga y descarga para circuitos RC.
Abrir herramienta →Decodifica códigos de color de inductores de 4 bandas a µH y mH.
Abrir herramienta →Agregue dispositivos, vea la potencia total, kWh diarios y costo anual de electricidad
Abrir herramienta →Decodifica códigos SMD de 3, 4 dígitos y EIA-96 a valores de resistencia.
Abrir herramienta →Component maths for people with a breadboard in front of them. These tools cover the calculations you hit repeatedly while building a circuit: what resistor a part needs, what a colour band or SMD marking means, how wide a trace has to be, and how long an RC network takes to settle.
Everything is worked in the open. Each tool shows the formula it used and the numbers it put into it, so you can check the result against your own working rather than trusting a black box — which matters when the consequence of a wrong answer is a dead component.
Which tool do I want?
| If you… | Use |
|---|---|
| You have a resistor in hand and need its value | Decodificador de colores de resistencia |
| The part is surface-mount with a 3 or 4 character code | Decodificador de códigos SMD |
| You are driving an LED and need the series resistor | Calculadora de resistencia LED |
| You need to drop a voltage down to a reference level | Calculadora de divisor de voltaje |
| You are sizing wire for a current, or worried about heat | Referencia de calibre de cable (AWG) |
| You are laying out a board and need copper width | Calculadora de ancho de pista PCB |
| You are building a timer or oscillator | Calculadora de temporizador 555 |
| You need a time constant for filtering or debouncing | Calculadora de constante de tiempo RC |
Tolerance is the thing beginners forget
Every calculation here produces an exact number, and no component you can buy is exact. A resistor sold as 220 Ω with a gold band is guaranteed only to sit within 5% of that — anywhere from 209 to 231 Ω. Stack a few 5% parts in one divider and the output can drift further than the reading you were trying to achieve.
This matters most where a result feeds a threshold. A divider setting a comparator trip point, a timing network deciding a pulse width, a current limit sitting just under a part's maximum — in those places, work out what the answer becomes at the tolerance extremes, not just at the nominal value. Where it matters, buy 1% parts; they cost almost nothing more.
The same applies to the standard value the tools round to. E24 gives you 24 values per decade, so the nearest stocked resistor to a calculated 237 Ω is 240 Ω. That is usually fine, and the tools tell you both numbers so you can decide.