Electronics Calculator Dashboard

🔬 ELECTRONICS CALCULATOR Dashboard 10 Calculators

Overview

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Calculators

10

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Domains

AC / DC

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Components

R, L, C, BJT

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Standards

IEC / EIA

Calculators

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Resistor Color Code

4-band & 5-band resistor decoder

R = (B1×10 + B2) × 10^Mult [4-band] | (B1×100 + B2×10 + B3) × 10^Mult [5-band]

Bands 4-Band 5-Band

Band 1 (1st digit) Black – 0Brown – 1 Red – 2Orange – 3 Yellow – 4Green – 5 Blue – 6Violet – 7 Grey – 8White – 9

Band 2 (2nd digit) Black – 0Brown – 1 Red – 2Orange – 3 Yellow – 4Green – 5 Blue – 6Violet – 7 Grey – 8White – 9

Band 3 (Multiplier) Black – ×1Brown – ×10 Red – ×100Orange – ×1K Yellow – ×10KGreen – ×100K Blue – ×1MViolet – ×10M Gold – ×0.1Silver – ×0.01

Band 4 (Multiplier) Black – ×1Brown – ×10 Red – ×100Orange – ×1K Yellow – ×10KGreen – ×100K Blue – ×1MGold – ×0.1 Silver – ×0.01

Tolerance Brown – ±1%Red – ±2% Green – ±0.5%Blue – ±0.25% Violet – ±0.1%Gold – ±5% Silver – ±10%None – ±20%

Resistance

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Tolerance

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Min Value

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Max Value

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Ohm's Law (AC / DC)

Solve V, I, R, P — any two known

V=IR | P=VI=I²R=V²/R | Z=√(R²+X²) | PF=cosφ=R/Z

Voltage V (V)

Current I (A)

Resistance R (Ω)

Power P (W)

Reactance X (Ω) — AC only

Frequency (Hz) — AC only

Voltage (V)

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Current (A)

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Resistance (Ω)

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Power (W)

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Impedance Z (Ω)

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Phase Angle φ

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Power Factor

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RC / RL / LC Circuit

Impedance, resonance & time constant

τ=RC | τ=L/R | f₀=1/(2π√LC) | Xc=1/(2πfC) | Xl=2πfL

Circuit Type RC Circuit RL Circuit LC Resonant RLC Series

Frequency (Hz)

Resistance R (Ω)

Capacitance C (μF)

Inductance L (mH)

Supply Voltage (V)

Xc (Ω)

—

Xl (Ω)

—

Impedance Z (Ω)

—

Phase Angle φ

—

Time Const. τ

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Resonant Freq.

—

Q Factor

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Current (A)

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⬇️

Voltage Divider

R1, R2 resistive divider & loaded output

Vout = Vin × R2/(R1+R2) | With load: Vout = Vin × (R2||RL) / (R1 + R2||RL)

Input Voltage Vin (V)

R1 (Ω)

R2 (Ω)

Load RL (Ω) — optional

Desired Vout (V) — find R2

Mode Calculate Vout Find R2 for target Vout

Vout (no load)

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Vout (with load)

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Current (mA)

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Power in R1+R2 (mW)

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Loading Error %

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R2 for target Vout

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LED Current Limiting Resistor

Series resistor for single or multiple LEDs

R = (Vs − N×Vf) / If | P_R = If² × R | P_LED = N × Vf × If

Supply Voltage Vs (V)

LED Forward Voltage Vf (V)

LED Forward Current If (mA)

No. of LEDs in Series

LED Color / Type Red (1.8–2.2V) Orange (2.0–2.2V) Yellow (2.1–2.4V) Green (3.0–3.5V) Blue (3.2–3.6V) White (3.0–3.5V) IR (1.5–1.9V) Custom

No. of Parallel Strings

Resistor Value

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Nearest E24

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Power in R (mW)

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Total LED Power

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🔋

Capacitor Charge & Energy

Charge Q, energy E, charge time & ripple

Q = C×V | E = ½CV² | Vt = V₀(1−e^−t/RC) | ΔVripple = I/(f×C)

Capacitance C (μF)

Voltage V (V)

Resistance R (Ω)

Time t (ms)

Load Current (mA) — ripple

Frequency (Hz) — ripple

Charge Q (μC)

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Energy E (mJ)

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Voltage at t

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Ripple Voltage

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Time Const. τ (ms)

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63% Charge Time

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99% Charge Time

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Inductor & Transformer

Inductive reactance, turns ratio & induced EMF

Xl = 2πfL | EMF = N×dΦ/dt | N1/N2 = V1/V2 = I2/I1 | L = μ₀μrN²A/l

Inductance L (mH)

Frequency (Hz)

Primary Voltage V1 (V)

Secondary Voltage V2 (V)

Primary Turns N1

Load Current I2 (A)

Xl (Ω)

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Turns Ratio N1:N2

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N2 (Secondary)

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Primary Current I1

—

Apparent Power

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Reflected R (Ω)

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Efficiency (est.)

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🔌

BJT Transistor Bias

Voltage divider bias — Q-point & stability

Vb = Vcc×R2/(R1+R2) | Ve = Vb−Vbe | Ie≈Ic = Ve/Re | Vc = Vcc−Ic×Rc

Vcc Supply (V)

β (hFE) — Current Gain

R1 (Ω)

R2 (Ω)

Rc — Collector (Ω)

Re — Emitter (Ω)

Vb (Base)

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Ve (Emitter)

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Vc (Collector)

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Vce (Q-point)

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Ic (mA)

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Ib (μA)

—

Region

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Stability S

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📈

Op-Amp Gain Calculator

Inverting, non-inverting & summing amplifier

Inv: Gain = −Rf/Rin | Non-Inv: 1+Rf/R1 | Diff: Vout=(V2−V1)×Rf/R1

Amplifier Type Inverting Non-Inverting Differential Summing (2 inputs)

Rin / R1 (kΩ)

Rf — Feedback (kΩ)

Vin1 (V)

Vin2 (V) — diff/sum only

Supply Voltage ±Vcc (V)

Gain (dB)

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Gain (V/V)

—

Vout

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Clipping?

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Electronics All-in-One Summary

Complete circuit snapshot: Ohm's Law + RC/RL + Voltage Divider + LED + Power budget

Full circuit analysis: V, I, R, P → RC time constant → Divider → LED resistor → Power budget

Supply Voltage (V)

Total Load (Ω)

Capacitance (μF)

Inductance (mH)

Frequency (Hz)

LED Vf (V)

LED If (mA)

No. LEDs (series)

Current (mA)

—

Power (mW)

—

Xc (Ω)

—

Xl (Ω)

—

Impedance Z (Ω)

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RC Time Const.

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RL Time Const.

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Resonant Freq.

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LED Resistor

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Total Power

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