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In this video I give a detailed description of the operation of a simple pulse power supply circuit on one transistor with an optocoupler. That is, for beginners in the video I explain the operating principle of the simplest phone charger, smartphone, which regulates its output voltage through a circuit with galvanic isolation containing an optocoupler (optotransistor). In addition, I talk about the important points and nuances of the main working electronic components found in such circuits. Link to the previous video describing the operation of the UPS - • A detailed explanation of the operation of the pulse ... Link to the video describing the operation of the blocking generator - • How a simple blocking gen ... Link to the ElectroHobby channel on Yandex Zen - https://zen.yandex.ru/electrohobby Link to the VKontakte group - https://vk.com/electrohobbyru Link to the ElectroHobby website » https://electrohobby.ru