PC849

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Optoisolators provide a reliable method of protecting delicate electronic circuits from high voltage or other electrical disturbances. In particular, the PC849 optoisolator consists of a phototransistor, photovoltaic output, and a photoconductive element. It also features a number of very useful applications and modes of operation.

The main function of a PC849 optoisolator is to provide electrical isolation between an input signal and an output signal. It does this by using two different devices; an input phototransistor and an output photovoltaic device. The input phototransistor is a light-sensitive transistor that is activated when light strikes its base, allowing a current to flow through it. The output photovoltaic device is a reverse biasing diode, which only allows current to flow in a reverse direction.

The PC849 optoisolator offers several various modes of operation, depending on the application. In the photoconductive mode, the output of the device is determined by the amount of light that strikes the phototransistor\'s base. This mode is typically used in controlling circuits with light detectors, such as IR sensors. In the photovoltaic mode, the output is determined by the amount of electrical current that is generated by the photovoltaic device. This is the mode of operation most typically used in communication systems.

One of the main applications for the PC849 optoisolator is in providing electrical isolation between high voltages and sensitive electronic components. This is done by connecting the high voltage to the input phototransistor and then connecting the output to the sensitive electronic components. The current generated by the phototransistor is then converted to a much lower voltage by the photovoltaic device, which is then routed to the sensitive components. This reduces the possibility of damage to the components from the high voltage.

The PC849 optoisolator can also be used for pulse-width modulation, which is a type of analog/digital conversion. This is done by connecting the input signal to the input phototransistor and then connecting the output to the photovoltaic device. The phototransistor\'s current output is then measured, and this measurement is used to determine the pulse width of the output voltage. This is useful for controlling the speed of motors, for example.

In the switch-mode, the PC849 optoisolator is used to switch a current in a circuit. This is done by connecting the input to the input phototransistor and then connecting the output to the photovoltaic device. When the input signal is high, the current output from the phototransistor will be low, and when the input signal is low, the current output from the phototransistor will be high. This is useful in controlling the speed of devices, as well as in dimmer switches.

The PC849 optoisolator is a versatile component with a number of applications. It can be used to provide electrical isolation between high voltages and sensitive components, for pulse-width modulation, and for switching a current. Its phototransistor and photovoltaic output make it a reliable and useful device for a variety of applications.

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