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An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).

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How can I output 5V from ESP8266 NodeMCU 3.3v input?

I want to control a High Torque Servo using the esp8266 with PWM. This servo's operation voltage is in the range: 4.8V - 7.2V. With the esp8266, the GPIO pins can only output a maximum 3.3v. What's th …
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