How to work with Open Collector outputs

Thank you for an excellent explanation of the use of such a ubiquitous circuit.

Another benefit might be that multiple switches (fysical or transistor) could pull the same input pin to ground. That might come in handy for some kind of interrupt-system, where multiple devices can interrupt the CPU when they need attention (think keyboard, disk drive, UART). The CPU must do some discovery to see which device pulled the interrupt ping low ;-)

Cool video

I think both grounds should be connected together (common ground)

How or why does adding the 10k resistor add 0.05mA of current?

Very informative video. By the way, I'm Vietnamese, and hearing "Chào buổi sáng" in an electronic video was quite unexpected, which pleasantly surprised me. Thank you!

Very well done!

nice to follow your chanel from Vietnam. Xin chào!!

Fantastic explanation of how the open collector output work and why there is no harm on having the sensor running with more than 3.3V. Thank you Chris!

this was exactly what i needed. thank you!