An optocoupler or opto-isolator consists of a light emitter, the LED and a light sensitive . I use latch 74hc and put 8 optocoulpers pc in 8 inputs of latch . PC Series. PC Series. High Density Mounting Type. Photocoupler PC Anode mark. PC Internal connection diagram. PC PC PC PC Photocoupler has a transistor which is controlled based on light (photon). So this IC basically has an IR LED and a photo-transistor inside it.

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Sign up using Facebook. Assuming that a single HCT output is only feeding this optocoupler, a logic 1 voltage of about 4. So I think based on above calculation, Input resistor of 1K will work fine and collector Pc187 resistor has to be added of value 10K. Note that the timing optocouplfr response through the optocoupler in the PCA model may not represent an accurate picture of the real delays to be expected in a physical circuit implementation.

I F in Fig. Sign up or log in Sign up using Google. Please try using the setup as shown in the figure. Andy aka k 10 Learner Learner 11 5. I want a 3. Learn about Electronics – Opto Coupled Devices. Field Effect Transistors 5.

Module 5.2

So there should be no issue with the high voltage and the 1K resistor is fine. I would not opt for that option. The output will not get high as soon as the input logic is made low and vice versa. I am using 1k res on pin1 pcc817 a pull down resistor of 1k on 3rd pin. This is where the isolation occurs. The digital signal given to the IR LED will be reflected on the transistor but there will be no hard electrical connection between the two.

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What is the pull down value? Another important parameter to consider while using an Optocoupleris the rise time t r and fall time t f.

The PC must then be capable of producing the necessary output from this low input current. Post as a guest Name. Then Pull high the collector pin of the transistor using a resistor here I have used 1K and connect the collector pin to the output of your desired logic circuit. If you have 12V feeding the input diode via 1K you will be producing a forward lc817 of about 10mA. This way the logic input will be reflected at the logic output and still provides and isolation between the two.

PC OptoCoupler Optoisolator DIP IC

But I dont want it like this. You contribute a lot to the site but I think that you go over the head of the OPs quite often using acronyms, initialisations and electronic concepts that the users may not have come across.


I might be wrong too. If you can’t take a screenshot of the relevant bit, use the built in schematic editor to redraw it.

Can you check my calculation based on your response as well as based on response in the comment section. Computers are expensive and easily damaged by mistakes otocoupler when connecting them to external circuitry. I am getting an output voltage of 3. Use the circuit below optocoupoer, and as datasheet suggests that the forward voltage is about 1. The start of the design process is to specify the input and output conditions the optocoupler is to link.

How to get 3. Sign up or log in Sign up using Google. Umar 3, 3 11 Understand the requirements for a typical optocoupler application. What is necessary is to ensure that R1 creates an appropriate current level from the input circuit to correctly drive optocouplsr LED side of the optocoupler, and that R2 creates appropriate voltage and current levels to supply the output circuit via the inverter. Bring 12 V to 3. Bipolar Junction Transistors 4.

Here is an LTSpice simulation waveform that shows the output voltage level that should be achievable.