Capacitive Transformerless Power Supply Calculator — Free Online Tool
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Capacitive Transformerless Power Supply Calculator

Calculate dropping capacitor and output characteristics for non-isolated power supplies

Instructions: Enter RMS Mains Voltage ($V_{mains}$), Mains Frequency ($f$), Output DC Voltage ($V_{out}$), and Desired Load Current ($I_{out}$) below.
Supply Parameters

Calculation Results

⚠️ Warning: Transformerless power supplies are NOT isolated from AC mains and pose a severe electric shock hazard. Use with extreme caution!

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