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Useful calculators and converters for electronics engineering
🔢 Calculator
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⚡ Resistor Calculator
Band 1 (First Digit)
Black - 0
Brown - 1
Red - 2
Orange - 3
Yellow - 4
Green - 5
Blue - 6
Violet - 7
Gray - 8
White - 9
Band 2 (Second Digit)
Black - 0
Brown - 1
Red - 2
Orange - 3
Yellow - 4
Green - 5
Blue - 6
Violet - 7
Gray - 8
White - 9
Band 3 (Multiplier)
Black - ×1
Brown - ×10
Red - ×100
Orange - ×1K
Yellow - ×10K
Green - ×100K
Blue - ×1M
Violet - ×10M
Band 4 (Tolerance)
Brown - ±1%
Red - ±2%
Gold - ±5%
Silver - ±10%
Calculate
Resistance: --
🔄 Unit Converter
Ohm (Ω)
Kiloohm (KΩ)
Megaohm (MΩ)
Farad (F)
Microfarad (μF)
Nanofarad (nF)
Picofarad (pF)
Henry (H)
Millihenry (mH)
Microhenry (μH)
↓
Ohm (Ω)
Kiloohm (KΩ)
Megaohm (MΩ)
Farad (F)
Microfarad (μF)
Nanofarad (nF)
Picofarad (pF)
Henry (H)
Millihenry (mH)
Microhenry (μH)
Swap ↔
📊 Voltage Divider Calculator
Input Voltage (Vin)
Resistor R1 (Ω)
Resistor R2 (Ω)
Vout: --
⚡ Ohm's Law Calculator
Voltage (V)
Current (A)
Resistance (Ω)
Power (W)
Enter any two values
💡 LED Resistor Calculator
Supply Voltage (Vs)
LED Forward Voltage (Vf)
LED Forward Current (If) - mA
Resistor: --
⏱️ RC Time Constant Calculator
Resistance (R) - Ω
Capacitance (C)
Farad (F)
Millifarad (mF)
Microfarad (μF)
Nanofarad (nF)
Picofarad (pF)
Capacitance Value
Time Constant: --
📻 LC Resonant Frequency Calculator
Inductance (L)
Henry (H)
Millihenry (mH)
Microhenry (μH)
Inductance Value
Capacitance (C)
Farad (F)
Millifarad (mF)
Microfarad (μF)
Nanofarad (nF)
Picofarad (pF)
Capacitance Value
Resonant Frequency: --
🔌 PCB Trace Width Calculator
Current (I) - Amperes
Copper Thickness (oz)
0.5 oz
1 oz
2 oz
Temperature Rise (°C)
Trace Width: --
🔋 Capacitor Charge Calculator
Capacitance (C)
Farad (F)
Millifarad (mF)
Microfarad (μF)
Nanofarad (nF)
Capacitance Value
Voltage (V)
Charge: --
🔗 Resistor Series/Parallel Calculator
Resistor 1 (R1) - Ω
Resistor 2 (R2) - Ω
Configuration
Series
Parallel
Total Resistance: --
⚡ Power Supply Calculator
Voltage (V)
Current (A)
Efficiency (%)
Output Power: --
📐 PCB Stackup Calculator
Number of Layers
2 Layers
4 Layers
6 Layers
8 Layers
10 Layers
Core Thickness (mil)
Prepreg Thickness (mil)
Copper Weight (oz)
0.5 oz
1 oz
2 oz
Total Thickness: --
📊 PCB Impedance Calculator
Trace Width (mil)
Trace Thickness (oz)
0.5 oz
1 oz
2 oz
Dielectric Thickness (mil)
Dielectric Constant (εr)
Characteristic Impedance: --
🔗 Differential Impedance Calculator
Trace Width (mil)
Trace Spacing (mil)
Dielectric Thickness (mil)
Dielectric Constant (εr)
Differential Impedance: --
🔌 Via Calculator
Via Diameter (mil)
Via Hole Diameter (mil)
Via Length/Thickness (mil)
Copper Thickness (oz)
0.5 oz
1 oz
2 oz
Via Resistance: --
📏 Trace Length Calculator
Signal Frequency (MHz)
Dielectric Constant (εr)
Target Delay (ns)
Trace Length: --
🌡️ Thermal Resistance Calculator
Power Dissipation (W)
Junction Temperature (°C)
Ambient Temperature (°C)
Thermal Resistance: --
🔋 Decoupling Capacitor Calculator
Current Step (A)
Voltage Ripple (mV)
Rise Time (ns)
Required Capacitance: --
💰 PCB Cost Estimator
Board Size (cm²)
Number of Layers
2 Layers
4 Layers
6 Layers
8 Layers
Quantity
Surface Finish
HASL
ENIG
OSP
Estimated Cost: --
⚡ Via Current Capacity Calculator
Via Diameter (mil)
Copper Thickness (oz)
0.5 oz
1 oz
2 oz
Temperature Rise (°C)
Max Current: --
🔧 Solder Joint Calculator
Pad Diameter (mil)
Component Lead Diameter (mil)
Solder Fillet Height (mil)
Solder Volume: --
⚡ Capacitor ESR Calculator
Capacitance (μF)
Frequency (kHz)
Dissipation Factor (DF)
ESR: --
🌀 Inductor Calculator
Number of Turns (N)
Core Area (cm²)
Core Permeability (μr)
Core Length (cm)
Inductance: --
🔄 Transformer Calculator
Primary Voltage (V)
Secondary Voltage (V)
Primary Turns
Turns Ratio: --
🔊 Filter Calculator
Filter Type
Low Pass
High Pass
Band Pass
Cutoff Frequency (Hz)
Resistance (Ω)
Component Values: --
💎 Crystal Oscillator Calculator
Crystal Frequency (MHz)
Load Capacitance (pF)
Stray Capacitance (pF)
Capacitor Values: --
🔥 Power Dissipation Calculator
Voltage Drop (V)
Current (A)
Resistance (Ω)
Power Dissipation: --
⏱️ Rise Time Calculator
Bandwidth (MHz)
Rise Time (ns)
Bandwidth/Rise Time: --
⚙️ Voltage Regulator Calculator
Input Voltage (Vin)
Output Voltage (Vout)
Output Current (A)
Power Loss: --
🛡️ Current Limiter Calculator
Supply Voltage (V)
Max Current (A)
Transistor Vbe (V)
Resistor Value: --
🔌 Pull-up/Pull-down Calculator
Supply Voltage (V)
Input Current (μA)
Resistor Type
Pull-up
Pull-down
Resistor Value: --
⏳ Time Constant Calculator
Resistance (Ω)
Capacitance
Farad (F)
Millifarad (mF)
Microfarad (μF)
Nanofarad (nF)
Capacitance Value
Time Constant: --
📊 Frequency Divider Calculator
Input Frequency (Hz)
Division Ratio (N)
Output Frequency: --
📈 Duty Cycle Calculator
High Time (ms)
Low Time (ms)
Duty Cycle: --
🔋 Battery Life Calculator
Battery Capacity (mAh)
Load Current (mA)
Efficiency (%)
Battery Life: --
❄️ Heat Sink Calculator
Power Dissipation (W)
Junction Temp (°C)
Ambient Temp (°C)
Junction-to-Case (°C/W)
Required Thermal Resistance: --
📈 Op-Amp Gain Calculator
Feedback Resistor (Rf) - Ω
Input Resistor (Rin) - Ω
Configuration
Inverting
Non-inverting
Gain: --
📊 PWM Calculator
Frequency (Hz)
Duty Cycle (%)
Voltage (V)
PWM Parameters: --
📉 Signal Attenuation Calculator
Input Power (dBm)
Output Power (dBm)
Attenuation: --
📡 Bandwidth Calculator
Upper Frequency (Hz)
Lower Frequency (Hz)
Bandwidth: --