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

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NiHaoMike:

--- Quote from: SilverSolder on December 11, 2021, 10:50:21 pm ---A good hack for circumventing this problem in a car is to use an audio signal tranformer to galvanically isolate the signal between the source and the destination device.  Miracle cure, in many cases.

--- End quote ---
Opamps and a few well matched resistors are a lot cheaper than a decent audio transformer.

SilverSolder:

--- Quote from: NiHaoMike on December 11, 2021, 11:20:28 pm ---
--- Quote from: SilverSolder on December 11, 2021, 10:50:21 pm ---A good hack for circumventing this problem in a car is to use an audio signal tranformer to galvanically isolate the signal between the source and the destination device.  Miracle cure, in many cases.

--- End quote ---
Opamps and a few well matched resistors are a lot cheaper than a decent audio transformer.

--- End quote ---

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.

ogden:

--- Quote from: NiHaoMike on December 11, 2021, 10:31:36 pm ---
--- Quote from: IanB on December 11, 2021, 10:02:42 pm ---Indeed. I'm a bit confused about the balanced 2.5 mm headphone connector. Apparently, balanced connections are good for improved noise rejection, but is there ever an issue with noise on a headphone cable?

--- End quote ---
Rarely an issue for headphones, but for amplifiers it's a big problem especially if the source device is connected to the noisy power ground.

--- End quote ---

Right. It gives better price/SNR, option to use unipolar supply with push-pull amp on the output - especially good for portable players. Also 2.5mm/4.4mm balanced output is compatible to balanced XLR inputs of hi-end audio gear.

ogden:

--- Quote from: magic on December 11, 2021, 04:37:24 pm ---No explanation of Quad DAC technology, but it's "acclaimed" :)

--- End quote ---

I wonder - maybe quad DAC is about using two stereo DAC's, one for each channel - to get better separation between channels?  :-//

magic:
Apparently something like that.
https://www.esstech.com/ess-technology-brings-advanced-audiophile-features-to-mobile-devices-for-the-first-time/

--- Quote ---QUAD DAC Technology – Internally connected parallel quad DACs deliver superb 124dB DNR and -112dB THD+N.
--- End quote ---

Fun fact: whenever there is an integrated amplifier in something, they point out how it is capable of driving "professional high impedance headphones" but don't mention "consumer low impedance headphones" too much :)

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