![switches - Opto-coupler output photo-transistor as normal BJT - Electrical Engineering Stack Exchange switches - Opto-coupler output photo-transistor as normal BJT - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/oLPAg.png)
switches - Opto-coupler output photo-transistor as normal BJT - Electrical Engineering Stack Exchange
![Photodarlington Output Optocoupler 4N33 4n32 with base connection - China Optocoupler 4N33 4n32, Semiconductor 4N33 819K DIP-6 | Made-in-China.com Photodarlington Output Optocoupler 4N33 4n32 with base connection - China Optocoupler 4N33 4n32, Semiconductor 4N33 819K DIP-6 | Made-in-China.com](https://image.made-in-china.com/202f0j00nFPVvmNoeGbw/Photodarlington-Output-Optocoupler-4N33-4n32-with-base-connection.webp)
Photodarlington Output Optocoupler 4N33 4n32 with base connection - China Optocoupler 4N33 4n32, Semiconductor 4N33 819K DIP-6 | Made-in-China.com
![Optocouplers - Working, Characteristics, Interfacing, Application Circuits | Homemade Circuit Projects Optocouplers - Working, Characteristics, Interfacing, Application Circuits | Homemade Circuit Projects](https://www.homemade-circuits.com/wp-content/uploads/2019/09/opto-basic-connection.jpg)
Optocouplers - Working, Characteristics, Interfacing, Application Circuits | Homemade Circuit Projects
![Juried Engineering Lite-On 4N25 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 20): Amazon.com: Industrial & Scientific Juried Engineering Lite-On 4N25 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 20): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/61ayjFDWzCL.jpg)
Juried Engineering Lite-On 4N25 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 20): Amazon.com: Industrial & Scientific
![Juried Engineering 4N26 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 10): Amazon.com: Industrial & Scientific Juried Engineering 4N26 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 10): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/71e0L5h6DqL.jpg)
Juried Engineering 4N26 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 10): Amazon.com: Industrial & Scientific
![Juried Engineering H11AA1M H11AA1 DIP-6 Through Hole AC Input Phototransistor Base DC Output Optocoupler 6-Pin Breadboard-Friendly IC (Pack of 20): Amazon.com: Industrial & Scientific Juried Engineering H11AA1M H11AA1 DIP-6 Through Hole AC Input Phototransistor Base DC Output Optocoupler 6-Pin Breadboard-Friendly IC (Pack of 20): Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/51h5NxP5KQL.jpg)