![SMD LED polarity marking: is the cathode marking standardized? - Electrical Engineering Stack Exchange SMD LED polarity marking: is the cathode marking standardized? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/1TP3Z.gif)
SMD LED polarity marking: is the cathode marking standardized? - Electrical Engineering Stack Exchange
![In this 555 blinking LED schematic, is the top LED polarity correct? I don't get how this would light up if pin 3 was OFF or ON. If polarity was reversed, I In this 555 blinking LED schematic, is the top LED polarity correct? I don't get how this would light up if pin 3 was OFF or ON. If polarity was reversed, I](https://preview.redd.it/in-this-555-blinking-led-schematic-is-the-top-led-polarity-v0-wpe963bi299a1.png?width=640&crop=smart&auto=webp&s=22590ed180f55be70eb2d9f3dfce58db51ae7ee3)
In this 555 blinking LED schematic, is the top LED polarity correct? I don't get how this would light up if pin 3 was OFF or ON. If polarity was reversed, I
![Determining LED Polarity - Optoelectronics - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key Determining LED Polarity - Optoelectronics - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key](https://global.discourse-cdn.com/digikey/original/2X/5/586cba8a102d781af769c6becd558a6a35733c93.jpg)
Determining LED Polarity - Optoelectronics - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key
![Determining LED Polarity - Optoelectronics - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key Determining LED Polarity - Optoelectronics - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key](https://global.discourse-cdn.com/digikey/original/2X/3/3c8053e6735c1d97d72ffc0ee0dda38d6d9a4613.jpg)