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What's the real reason that laptop batteries are made not-accessible?

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PlainName:
Aren't phones supposed to be smaller than a desktop screen?

SilverSolder:

--- Quote from: dunkemhigh on January 22, 2022, 05:22:48 pm ---Aren't phones supposed to be smaller than a desktop screen?

--- End quote ---

Yeah, fixed it...

PlainName:
Thanks :)

coppice:

--- Quote from: james_s on December 03, 2021, 02:47:35 am ---[Can you give an example of even one computer or smartphone where replacing the battery is "absolutely impossible"? I'm not aware of one. Even devices that have the battery glued in it can still be replaced, even if you have to take it to a technician that is properly equipped. Some batteries are held in by adhesive, but they are not potted in epoxy, they can still be replaced. Most people who buy these sort of devices don't care if they can replace the battery themselves, there is no business reason to invest the engineering and materials in making a robust mechanism to make the battery easily accessible.

--- End quote ---
There are plenty of phones glued together to the point where the quality of the phone after a repair is a bit hit or miss - depending mostly on how good the technician was who did the job. However, I have yet to see a laptop that couldn't reliably be opened by anyone with simple tools (although I've heard nasty things about some Apple products, but I never use them). A few screws usually gets you access to replace or expand disks, memory and the battery. The battery may be stabilised in its place with some glue, but this is reasonably easy to separate and replace. It only has to be functional, rather that super neat. The glue holding an entire phone together is a PITA.

Bassman59:

--- Quote from: David Hess on December 13, 2021, 09:16:00 pm ---
--- Quote from: SilverSolder on December 12, 2021, 08:49:43 pm ---
--- Quote from: NiHaoMike on December 12, 2021, 12:31:11 pm ---
--- Quote from: SilverSolder on December 11, 2021, 11:41:10 pm ---Does that solve ground loop issues though? Other than using optical coupling of some kind, I can't think of an alternative to a transformer for that.
--- End quote ---

With sufficiently well matched resistors, the CMRR of a differential amplifier is more than good enough.
--- End quote ---

I will definitely try that (thanks @David Hess as well). 

The audio transformers sold for this purpose on Amazon did not measure well...   to put it mildly! :D    It shouldn't be hard to make an op amp work better than that...
--- End quote ---

If you need better rejection, then 0.1% resistors are inexpensive, but the AC common mode rejection becomes more important and will need to be adjusted using a trimmer capacitor.  I have only seen instrumentation go to this much trouble.  Audio applications do not often need this level of performance.
--- End quote ---

You need high levels of performance when your input stage is connected to a mixer which drives a big PA.

Anyway, the easy solution to the problem is to use one of the THAT differential amplifiers. Matched/trimmed resistors built in. Yes, you can degrade the performance with whatever you connect to it, but at least the amplifier is solid.

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