If you ever send your schematic to someone else, it won't work unless you include your potentiometer symbol and model with the schematic file. Be aware that if you add any potentiometer symbol to your schematics, you must always keep that potentiometer symbol and that potentiometer subcircuit (model) with your schematic. The technique allowed efficient MO phase shift owing. analyzing a Zero Crossing Detector using OpAmp and Optocoupler - Zero-Crossing-Detector-using-OpAmp-and-Optocoupler-Simulation-with-LT-Spice/opto.asc at. But it can look "pretty" on your schematic to have a potentiometer symbol, if you want to use the schematic for something other than LTspice simulations. Silicon waveguide optical isolators were fabricated by direct bonding of magneto-optical (MO) garnet. Anyone can place two resistors in series. (Some commercial programs based on SPICE might have one I'm not talking about that.) Every potentiometer is just two resistors in series. That is why SPICE never came with a potentiometer model. I suggest trying these ones: The other thing you can do is to use two regular resistors. There are many, many, many potentiometer symbols and models to try. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. By sampling the isolated output voltage directly from the primary-side flyback waveform, the parts require no third winding or opto-isolator for regulation. The HCNR201/200 analog optocoupler is commonly added to isolate the analog signal in the front end module of an application circuitry. The LT8304/LT8304-1 are monolithic micropower isolated flyback converters. Search (probably Ctrl-F) for "potentiometer". Analog isolation is still widely used in motor drives, power monitoring, etc whereby applications typically use inexpensive analog voltage control for speed, intensity or other adjustments. Start here: Files > z_yahoo > all_files_z_yahoo.htm Download it, then open it in your web browser. Optoisolator Transistor with Base Output 5300Vrms 1 Channel 6-DIP. They do not all work the same, so try a few until you find one that you like best. Sorry for the long story, I am still learning.J.bernabe1 asked, "Another question Have you any potentiometer ?" There are many potentiometer symbols already that were uploaded to this group over years. I can connect it to the 3.3 V or 5 V GPIO pins. Ive spotted the 6N137-L which can work with 3-5 V input voltage. I have two Raspberry Pi that Id like to connect together through a serial interface. Hence I started searching for it and found one i.e SFH628A-3, however I am not good in understanding their datasheet and need help to see if it fits. Serial isolation with 6N137 opto-coupler. Due to all these factors, someone suggested me to find another opto which works at very low current. I am also not able to use a x-capacitor or use a transformer due to size constraints. Now I could reduce the resistance, however the heat dissipated would be more (which I don't want). I calculated the voltage and found that for 145V AC and a series resistance of 440K, the current is just 0.33mA which may to be insufficient to turn on the opto. While testing my circuit at various input voltages I found that the opto will start giving fluctuating output when my voltage is 145V. I had connected a series resistance of 440K (1/4W) and everything seems to be fine i.e the microcontroller is able to sense when there is line and otherwise. The optocouplers I have evaluated are PC814, H11AA1 and SFH620A-3, out of which I found SFH620A-3 to be more efficient (must be due to the better CTR). I am trying to detect line voltage (230V AC, if the supply is ON/OFF) by a microcontroller with the help of an AC optocoupler.
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