EL817

Optoisolators or opto-couplers are electronic devices which are used to transfer electric signals between two different circuits with a high degree of electrical isolation, without the need for a physical connection. The EL817 is a 4-pin optoisolator from Everlight Electronics with a transistor photovoltaic output. It offers an isolation voltage of 5000Vrms and is useful in applications which require reliable electrical galvanic isolation. This article outlines the application field and working principle of the EL817.

Application field of EL817

The EL817 could be used in a wide range of circuits for signal transmission and other applications. Such applications include power supply control, motor drive circuits, medical equipment, heating and ventilation systems, and security systems. The EL817 is highly efficient and can offer electrical isolation up to 5000Vrms. It can also measure the voltage quickly and accurately, making it a reliable device for use in a wide range of industrial systems and applications.

Working principle of EL817

The EL817 is a 4-pin optoisolator with a transistor photovoltaic output. It is composed of an optical transmitter (LED) and a detector (photodiode). The LED is connected to one side of an electrical circuit and the photodiode is connected to the other side. When a signal is applied to the LED, the LED switches on, which then generates a light signal. This light signal is detected by the photodiode, which then produces a current in the photodiode. This current is then used to switch the transistor, resulting in an output signal. The output signal can then be used to power other devices or control devices in the circuit.

Conclusion

The EL817 is a 4-pin optoisolator from Everlight Electronics which offers an isolation voltage of 5000Vrms and useful in a range of applications requiring reliable electrical galvanic isolation. The device is composed of an optical transmitter (LED) and a detector (photodiode), and uses the light signal generated by the LED to switch a transistor, thus producing an output signal. This output signal can then be used to power other devices or control devices in the circuit.