How do I use optocoupler 817?
The applications of PC817 Optocoupler include the following.
- In Isolation Circuits.
- Switching Circuits with Microcontroller I/O.
- Isolation of Signal.
- Circuits of Noise Coupling.
- AC/DC Power control.
- It is Reliable to utilize because of its functionality.
- For Transmission of Signal.
- Noise Coupling Circuits.
How do optocouplers work?
An Optocoupler can do the job. Let there be light! This device allows you to transmit an electrical signal between two isolated circuits with two parts: an LED that emits infrared light and a photosensitive device which detects light from the LED.
How do I choose an optocoupler resistor?
In choosing appropriate values for R1, the value for the current limiting resistor is set to produce the correct forward current (IF) through the infrared LED in the optocoupler. R2 is the load resistor for the phototransistor and the values of both resistors will depend on a number of factors.
What is current transfer ratio of optocoupler?
The gain of the optocoupler is expressed as a current transfer ratio (CTR), which is the collector current (IC) of the output divided by the forward current (IF) of the input and multiplied by 100 %.
Why do optocouplers fail?
Therefore, it can be determined that the failure of the optocoupler is caused by the leakage current of the LED and the change in the breakdown voltage. In fact, after the 36th hour of heating is over, the performance of the optocoupler goes into an unstable state. The corresponding temperature is 143 °C.
What is CTR ratio in optocoupler?
Current transfer ratio or commonly known as CTR is the ratio of the collector current to the forward current of an optocoupler. It is synonymous to a current gain of a bipolar junction transistor.
What is the best optocoupler to use for isolation tasks?
PC817 is a widely used optcoupler and works well in electronic circuit for a single isolation task. If you require more isolation tasks at the same time then you can also use other optocouplers that contains couple of IR LEDS and phototransistors in a single package.
Can optocoupler be used to control AC circuit using DC voltage?
Optocoupler for Controlling AC Circuit using DC voltage: In the upper circuit The LED is again controlled by 9V battery through 10k resistor and the state of the switch. On the other side a photo-TRIAC based opto-coupler is used, which control the AC LAMP from the 220V AC outlet.
What are the applications of el817c optocoupler/phototransistor IC?
Applications of EL817C Optocoupler/Phototransistor IC 1 Measuring Instruments 2 Home appliances 3 Telecommunication devices 4 Programmable controllers
How does PC 817 work?
The first one is wide lead (Pb) spacing option and the second one is SMT gullwing lead form option. PC 817 has an internal LED and a photo transistor. The photo transistor’s base becomes activate when LED throws light on it. The output obtained can be divided into two formats either common emitter or common collector.