Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Incorrect.
The collector-emitter voltage across a Darlington transistor is always more than 1.4v and can be as high as 2v to 4v.
"and may have a higher gain than the 2N2222, so be sure that you are properly limiting the current to the LEDs if you weren't already doing so."
This is a technically false statement.
Both transistors will be turned on fully and it is just the voltage between collector-emitter that has to be taken into account.
The collector-emitter voltage across a Darlington transistor is always more than 1.4v
We don't know the current. Because both transistors are to do the same job (replacement) then I will assume low current. The graph for the TIP120 shows a gain of 475 at 100mA. At lower current, lower gain. This part was designed to run at 2A.and may have a higher gain than the 2N2222