Review on Durable DaFuRui Channel Optocoupler for Efficient Compatibility by Todd Look

Although there were many values, the increments chosen were not always the most commonly used. Most 1/4W applications do not involve resistors below 100 ohms and above 100k ohms. For more complete coverage, it is recommended to choose values based on standard increments of 5%, or 10% at worst. Search for as many values as possible, but check the details in the listing.