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Can anyone help with AQA Gcse Engineering?

Basically, I missed a few lessons and therefore a bunch of notes. I don't know how a comparator circuit or 4026 counter circuit works, and there isn't really anyone I can ask for notes, nor can I find the video that was meant to explain it on my classroom. I'm going to need to know these for my NEA so I really appreciate any help asap. Thanks

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by ☆☆☆
Basically, I missed a few lessons and therefore a bunch of notes. I don't know how a comparator circuit or 4026 counter circuit works, and there isn't really anyone I can ask for notes, nor can I find the video that was meant to explain it on my classroom. I'm going to need to know these for my NEA so I really appreciate any help asap. Thanks

If possible, could yall also recommend any channels which help with the circuits/ electronic systems component of gcse engineering?

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