Transformerless power supply on a field-effect transistor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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On fig. 6.17 shows a diagram of a simple transformerless power supply based on a BUZ41A transistor.
Through the transistor VT1 connected according to the common drain circuit, the capacitor C3 is charged to a voltage approximately 3 V less than the voltage at the zener diode VD4.
An alternating voltage with a phase shift determined by the capacitance of the capacitor C1 opens the transistor VT2, which stops the charge of the capacitor C3 at the beginning of each positive half-wave of the mains voltage.
Author: Semyan A.P.
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