Electronics calculators
The sums Arduino and electronics projects need most. All free, no account needed.
- Resistor color code
The value of a 4 or 5 band resistor from its colors, or the colors of a value.
- LED resistor
The resistor in front of an LED, for its supply, color and current.
- Ohm's law
Enter two of voltage, current, resistance and power, get the other two.
- Series and parallel resistors
The total of resistors in series or in parallel.
- Voltage divider
Like bringing 5 V down to 3.3 V with two resistors: the output, or the resistor it takes.
- 555 timer
A 555's frequency, high and low time, or the length of a single pulse.
- SMD resistor code
The value of the 103, 4R7 or 01C on an SMD resistor, or the code of a value.
- Capacitor code
What the 104 on a ceramic capacitor is in pF, nF and µF.
In the app, tick off every wire, match the parts to your inventory and pick up where you left off.
