Transformerless power supply FET

Transformerless power supply FET
The circuit shows a diagram of a simple transformerless power supply for transistor BUZ41A. Through the inclusion of the common-drain transistor VT1 NW capacitor charging to a voltage of about 3 smaller than the zener voltage of VD4. An alternating voltage with a phase shift, determined by the capacity of the capacitor C1, transistor opens VT2, which stops the charge capacitor NW at the beginning of each positive half-wave supply voltage. (more…)