Jan 4, 2020 · This 3.7 VDC is fed to the input of optocoupler PC817 pin 1 and 2. On the output, I wanted to read the high and low through an Arduino connected to pin 3 and 4 of the optocoupler.

Jul 17, 2015 · I am using PC817 opto coupler. I want a 3.3 V output. In its 1st pin I am giving 12 V and 2nd pin is gnd. I have connected a pulldown resistor on 3rd pin, but I am confused …

Perhaps your friend is comparing the photo transistor-output PC817 to the type of opto coupler that has an logic output type IC or a photodiode driving a transistor on the output. For example …

May 20, 2022 · Looking at a typical PC817 datasheet I see the following response times rise (4-18µs) fall (3-18µs) and a cut-off frequency of 80kHz. Does that mean a PC817 can be used up …

Jul 12, 2024 · Current to PC817 IR LED will be about (3.3-1.0)/1k8=1.28mA. In worst case current transfer ration of PC817 can be as low as 50% and therefore collector current can theoreticaly …

Jun 17, 2025 · I'm trying to simulate an optocoupler circuit in KiCad 8.0 using ngspice, specifically with a PC817 optocoupler, but I ran into several issues because I couldn't find a working .lib or …

Oct 12, 2022 · I am using an optocoupler (PC817) to provide isolation between sensor pulse output and microcontroller digital input (GPIO pin). The sensor voltage is rated = 5vdc-24vdc …

Oct 2, 2022 · ESP32 opto-isolated relay board not working - PC817 opto-isolator, 2N3904 NPN BJT and SRD-05VDC-SL-C relay Ask Question Asked 3 years, 1 month ago Modified 10 …

Jan 30, 2023 · I want to control a 5 V input on another device with a ESP8266 by using a PC817 opto-isolator. I am using the following wiring: The output pin is connected to an Arduino-like …

Apr 27, 2021 · Recently, I am doing the flyback, when I design the control stage I have some questions: This is the optocoupler(PC817) I used and this figure is Current Transfer Ratio vs. …