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This calculator is an online tool to quickly determine the capacitor value required for transformerless power supply circuit. A simple transformerless power supply with resistive load can be used if there is a need to connect to the AC mains a load designed for a voltage much less than the mains voltage, for example, a soldering iron. In this circuit a capacitor and resistive load are connected in series to AC mains.
Voltage Divider Calculator is a simple easy-to-use tool that helps you evaluate the output voltage or resistors values in a single voltage divider according to Ohm's law.
Zener voltage regulator calculator allows you to quickly determine the series resistor value of a Zener diode. This tool also displays recommended resistor wattage as well as resistor color coding and SMD resistor code.
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