Hi,
"Connected drain" to an input... also need pullup / pulldown resistors.
General rule: Don't leave any input (used or not) of any IC floating. With "LS" type they may be pulled low internally.
But "LS" types are old, slow, power consuming and provide low HIGH levels. I'd use HC or HCT types. (Mainly differ on supply voltage range and input HIGH levels)
But there are a lot of other families with different features.
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Your application seems to use high switching currents. Thus you need a proper PCB layout. No breadboard!
You need a true power plane. Copper pour is no GND plane!
Also
each power supply input of
each IC should have it's own decoupling capacitor.
Use a (free) schematic software with PCB layout feature.
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Would it be acceptable to post a PDF of a hand drawn schematic or is that a bit rude/disrespectful?
Many times here in this forum I already recommended this.
Any schematic - even hand drawn - is better than none. There's nothing against hand drawn ones.
No PCB layout without schematic
But as soon as you want to do a PCB layout I recommend to use software.
Klaus