The Transformerless Power Supply Calculator is now available on our site!

Transformerless Power Supply 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 (V_out) much less than the mains voltage (V_in), for example, a soldering iron. In this circuit a capacitor (C) and resistive load (RL) are connected in series to AC mains.