Capacitive Power Supply Calculator
Calculate the required dropper capacitor C (μF), capacitive reactance Xc, discharge bleeder resistor, and inrush limit resistor for transformerless RC power supplies.
⚠️ Transformerless supplies are best for low current < 100mA
Results
| Calculated Capacitor C | — μF (— nF) |
| Rec. Standard Size | — μF |
| Capacitive Reactance Xc | — Ω |
| Min Voltage Rating | — |
| Limit Resistor Rlimit | — Ω (≥ — W) |
| Bleeder Power Pbleed | — W |
Formulas
Reactance: Xc ≈ (Vin - Vout) / Iout
Capacitance: C = 1 / (2π × f × Xc)