EE Tools - OXI Labs

Through-Hole Resistor Calculator

1.00 kΩ

±5%

Range: 950 Ω - 1.05 kΩ

SMD Resistor Calculator

102

3-digit

Enter SMD Code:

Format: XXY where XX is the value and Y is the multiplier (10^Y)

Examples: 102 = 1kΩ, 473 = 47kΩ, 4R7 = 4.7Ω

1.00 kΩ

±5%

Range: 950 Ω - 1.05 kΩ

Capacitor Calculator

104

Capacitor Code:

Tolerance:

3-digit code: First 2 digits = value, 3rd digit = multiplier (in pF)

Examples: 104 = 100nF (0.1µF), 473 = 47nF, 222 = 2.2nF

R notation: 2R2 = 2.2pF, 1R0 = 1.0pF

100 nF

(100,000 pF)

±10%

Range: 90 nF - 110 nF

Through-Hole Inductor Color Code

10 µH

±5%

SMD Inductor Calculator

100

SMD Inductor

Enter SMD Code:

Format: XXY where XX is the value and Y is the multiplier (in µH)

Examples: 100 = 10µH, 101 = 100µH, 4R7 = 4.7µH

Note: Some use nH base - check manufacturer datasheet

10 µH

±20%

Ohm's Law Calculator

Enter any two values to calculate the other two. V = I × R, P = V × I

Voltage (V):

Current (A):

Resistance (Ω):

Power (W):

Enter 2 values

LED Resistor Calculator

Supply Voltage (V):

LED Forward Voltage (V):

LED Current (mA):

Number of LEDs (series):

140 Ω

Nearest standard: 150 Ω

Power: 0.06 W (use ⅛W)

Voltage Divider Calculator

Vout = Vin × R2 / (R1 + R2)

Input Voltage (V):

R1 (Ω):

R2 (Ω):

Vout = 6.00 V

Ratio: 0.500

Current: 0.60 mA

Power Dissipation Calculator

Voltage (V):

Current (A):

0.50 W

Recommended: 1W resistor

Battery Life Calculator

Battery Capacity:

Load Current:

Efficiency (%):

16.0 hours

(0.67 days)

555 Timer Calculator

R1 (Ω):

R2 (Ω):

C (µF):

48.1 Hz

Period: 20.79 ms

Duty: 66.7%

High: 13.86ms, Low: 6.93ms

RC Time Constant Calculator

Resistance (Ω):

Capacitance (µF):

τ = 1.000 s

63.2% charge/discharge time

5τ (99.3%) = 5.00 s

Cutoff freq: 0.159 Hz

LC Resonance Calculator

Inductance (µH):

Capacitance (pF):

1.592 MHz

ω = 10.00 Mrad/s

Reactance at resonance: 628.3 Ω

RC Low-Pass Filter

R (Ω):

C (nF):

fc = 159.2 Hz

-3dB point

τ = 1.00 ms

RC High-Pass Filter

R (Ω):

C (nF):

fc = 159.2 Hz

-3dB point

τ = 1.00 ms

Band-Pass Filter (RC)

High-Pass R (Ω):

High-Pass C (nF):

Low-Pass R (Ω):

Low-Pass C (nF):

159.2 Hz - 1592 Hz

Bandwidth: 1.43 kHz

Center: 503.3 Hz

PCB Trace Width Calculator

Current (A):

Copper Thickness (oz):

Temperature Rise (°C):

Trace Length (mm):

0.25 mm (10 mil)

Resistance: 48 mΩ

Voltage drop: 48 mV

Via Current Calculator

Via Diameter (mm):

Via Plating Thickness (µm):

Via Height/PCB Thickness (mm):

Temperature Rise (°C):

Max: 0.85 A

Resistance: 1.8 mΩ

Use multiple vias for higher current

Decoupling Capacitor Guide

IC Type:

Supply Voltage (V):

100nF ceramic (0402/0603)

+ 10µF bulk capacitor

Place as close to VCC/GND pins as possible

X5R or X7R dielectric recommended

dB / Power / Voltage Converter

Decibels (dB):

Power: 2.00×

Voltage: 1.41×

AWG Wire Gauge Converter

AWG:

0.326 mm²

Diameter: 0.644 mm

Max current: ~7A (chassis)

Resistance: 52.9 mΩ/m

Frequency / Wavelength Converter

Frequency:

Medium:

λ = 12.49 cm

λ/4 = 3.12 cm

λ/2 = 6.25 cm