Can this calculator design a safe 12V power supply for my project?

The calculator provides theoretical output voltage based on your inputs, but capacitive transformerless supplies have safety risks and regulatory restrictions. Always consult verified schematics and safety standards before building mains-powered circuits.

How do I choose the right capacitor value for my circuit?

Enter your desired input voltage, frequency, load resistance, and Zener voltage into the calculator. It will output the resulting voltage and current, helping you iterate capacitor values until you reach your target output.

What is the difference between capacitive and resistive transformerless power supplies?

Capacitive supplies use a capacitor to reduce voltage with lower energy dissipation as heat, while resistive supplies use a resistor to drop current. Capacitive versions are generally smaller but require careful Zener diode selection for voltage regulation.

Why does my calculated output voltage differ from a real circuit?

The tool uses ideal formulas. Real circuits lose voltage across component tolerances, parasitic resistance, and heat. The calculator also assumes a stable input frequency and does not factor in capacitor aging or load fluctuations.

ElectricalFree Tool

Capacitive Transformerless Power Supply Calculator

Provided byOmni Calculatoromnicalculator.com

Use the capacitive transformerless power supply calculator to find your circuit's output voltage and input current.

Use This Tool

Electronics and circuits calculators

Screenshot of Capacitive Transformerless Power Supply Calculator on Omni Calculator — omnicalculator.comOpen the live tool →

About this tool

What Capacitive Transformerless Power Supply Calculator does

A capacitive transformerless power supply calculator determines the theoretical output voltage and input current for a circuit based on its component values. Users input the RMS input voltage, Zener voltage, forward bias voltage, frequency, capacitance, and load resistance to see the resulting output voltage and necessary input current. The tool helps electronics designers and students understand how charge storage components affect power delivery in AC circuits and avoid short-circuit risks. Omni Calculator's version stands out by offering a suite of related educational articles alongside the calculator, explaining concepts like transformerless circuit types, how to increase current, and Zener voltage calculation, providing context beyond simple number-crunching.

Step by step

How to use the Omni Calculator Capacitive Transformerless Power Supply Calculator

1
Input the RMS voltage of the AC source
2
Enter the Zener diode voltage rating
3
Specify the forward bias voltage of the rectifier
4
Set the operating frequency and capacitance value
5
Provide the load resistance to calculate output voltage and input current

Is it right for you

Best for

Electronics hobbyists, students, and engineers who need to quickly determine component values for a capacitive transformerless power supply without manually solving complex AC circuit equations.

Limitations

Results are theoretical estimates based on ideal component values
Does not account for real-world component tolerances or heat dissipation
No option to switch between metric and imperial units for component values

Questions

Capacitive Transformerless Power Supply Calculator FAQ

Can this calculator design a safe 12V power supply for my project?: The calculator provides theoretical output voltage based on your inputs, but capacitive transformerless supplies have safety risks and regulatory restrictions. Always consult verified schematics and safety standards before building mains-powered circuits.
How do I choose the right capacitor value for my circuit?: Enter your desired input voltage, frequency, load resistance, and Zener voltage into the calculator. It will output the resulting voltage and current, helping you iterate capacitor values until you reach your target output.
What is the difference between capacitive and resistive transformerless power supplies?: Capacitive supplies use a capacitor to reduce voltage with lower energy dissipation as heat, while resistive supplies use a resistor to drop current. Capacitive versions are generally smaller but require careful Zener diode selection for voltage regulation.
Why does my calculated output voltage differ from a real circuit?: The tool uses ideal formulas. Real circuits lose voltage across component tolerances, parasitic resistance, and heat. The calculator also assumes a stable input frequency and does not factor in capacitor aging or load fluctuations.

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