EL817(M)-VG

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Optoisolators - Transistor, Photovoltaic Output are devices used in electrical and electronics engineering for isolating an electrical circuit from another. The EL817(M)-VG is an optoisolator primarily used as an interface for driving LED displays. The device is composed of a light-emitting diode (LED) combined with a photo-sensitive transistor, along with two resistors. This combination provides electrical isolation between two parts of electrical circuits, thus preventing any interference with other circuits.

The working principle of the EL817(M)-VG optoisolator is simple. When an electrical signal is supplied to the input driven LED, the output transistor becomes saturated, closing an isolated switch. On the other hand, when the LED is turned off, the output transistor is turned off, thus, opening the isolated switch. Thus, this device is mainly used for low voltage logic applications with optical isolation.

The EL817(M)-VG optoisolator is mainly used for switching low voltage signals and for driving light emitting diodes (LED) displays. As a low voltage indicator, the device can be used in many electrical and electronic applications that require isolation of the inputs and outputs. For example, it can be used in digital logic, power supply circuits, control systems, etc. Furthermore, the optoisolator is also used in DC relays, for collecting current, voltage and temperature measurements, and in data interfaces for serial communication.

When used for LED displays, the EL817(M)-VG provides a means for driving the LED and controlling the brightness of the display. The LED is driven by a pulse width modulation (PWM) signal, thus, creating an optical isolation between the LED and the controlling circuit. This ensures the LED display will only be activated when the correct signal is supplied and that no damaging interference will be received from other circuits.

The EL817(M)-VG optoisolator can also be used in microcontroller-based systems, providing an isolated interface between the analog signal processing and the digital signal control. This pattern is used in a variety of control systems, such as home automation, industrial automation, and robotics. For instance, this device can be used in a microcontroller-based night light, where an optoisolated interface is required to dim the LED at night.

In conclusion, the EL817(M)-VG optoisolator is a device designed for isolating two parts of an electrical circuit. Its application field mainly includes low voltage logic circuits, LED displays, DC relays, serial communication interfaces, and microcontroller based systems. Thanks to its optical isolation feature, this device ensures that the electrical signals supplied to the LED are not interfered with other electrical systems.

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