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Disclaimer: I am not the YT uploader. I am simply using the video as a tool for learning circuitry as a hobby.
The fifth circuit in the video timestamp 8:34.
If anything is wrong with this circuit, please explain what and why.
Note: The resistor with a toggle switch before it is in the YT video connected from the 5V rail on top and the middle-most transistor directly below it. It serves no purpose other than a battery drain, so I put in a switch to show how it messes with the LED current.
Use the switch to reconnect it and see how it messes with the circuit. IMO, that resistor should not exist anywhere in here. If I'm wrong, please detail why.
Also note: I can't tell exactly which colors the resistor bands are in the YT video, so I have just used 1k Ohm for all. I used https://resistorcolorcodecalc.com/ to try to find out, but I can't tell what the colors are with the glare.
Also Also Note: When switch A (the left one, as said in the video) is on, its signal is able to flush back to ground because it's on the lower NPN. This changes the amperage getting to the LED so the LED shines brighter on the B switch.
The A and B are not diagramed in the hand-drawn image of the video to be the same as what's on the breadboard.
I mapped this circuit in the app according to how I see the breadboard in the video.
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