Questions tagged [apple]
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27
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MC6820 PIA operation on the Apple 1
I'm writing an emulator for the MOS 6502 processor.
In order to test it, I decided to run the ROM from the Apple 1.
The Apple 1 uses a Motorola MC6820 PIA (Peripheral Interface Adapter) for ...
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How to extend USB-C cable (USB 3)
It's look like this question is simple, but it's not at all.
See here what I did.
I have MacBook Air M1 base model, and I have lack of capacity, it's only 256, so I thought I need more space
So I ...
1
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1
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How are Mac AC adapters compatible when they are different voltages?
I recently had my Mac AC adapter die on me, so I just cut the end off and soldered it on to an old Lenovo AC adapter I had laying around. Since they are both 20V AC adapters, it works fine, but I am ...
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Is there any voltage regulation on this board from an Apple Trackpad teardown? [closed]
Board:
Teardown, with brief descriptions of the major chips below:
Red: Broadcom BCM2042 for Bluetooth connectivity
Orange: Broadcom BCM5974 touch screen controller chip
Yellow: SST 25WF020 provides ...
- 105
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What could be the reason behind the variation in coil size inside Apple's Magic Trackpad 2 haptic motor?
**Disclaimer: This is a speculative question looking for electromagnetic coil advice, using Apple construction decisions as the talking point.
Looking through iFixit's teardown of the Apple Magic ...
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2
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514
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Did my wireless charger melt because of another wireless charger nearby? [closed]
I got home today and immediately smelled burnt plastic. I discovered that an Apple Watch charger burned and melted (every part of the charger is original Apple.) See included photos: https://drive....
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181
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USB Charger (Samsung/Apple/Dedicated)
I have read a lot of lines about D+/D- Voltage when using different devices. Also the Article from maxim integrated. The conclusion is:
I test it with iPhone X(iOS 15.6.1) and i found something ...
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Suitable Replacement RIFA Capacitors for Apple IIE PSU
I have an Apple IIE that I'm trying to bring back to life and in my research, everything suggests replacing the RIFA capacitors in the power supply. I'm looking for suitable replacement RIFA ...
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2
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Trouble simulating an instrumentation amplifier on KiCad
So... I'm trying to build an EMG sensor for biofeedback purposes, but I'm having loads of trouble both on the breadboard and on the CAD side as well. I'm using a M1-processor mac mini which could be a ...
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Macintosh Classic video input
I want to modify or rebuild the video amplifier circuit of the Macintosh Classic so that it accepts 8 bit grayscale input. Original circuit accepts 1 bit 5V P-P video signal. First idea was just to ...
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How to get working "specs" of iMac fans from logic board schematics? [closed]
I would like to salvage these three fans
They come from an Apple iMac 17-Inch "Core 2 Duo" 2.0 (Late 2006 - iMac5,1 - A1208 - 2114)
CPU Fan
Apple Service Source P/N: 922-7641
Apple P/N (on ...
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43
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How to determine proper capacitors to replace a battery for an Apple Magic Trackpad 2?
I have several Apple Magic Trackpad 2 devices and am finding that the batteries routinely go bad on these. They swell and deform the trackpad such that it doesn't stay flat with the desk / tray ...
- 159
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1
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754
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Is 3.5mm jack to female Apple Lightning adapter technically possible?
I couldn't find a trustworthy source for whether Apple EarPods are digital or analog, but I'm pretty sure it is digital as most teardowns show a chip on it that might be a DAC. Should this make ...
- 513
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210
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Visual circuit simulation on a Mac
I am currently trying to design a circuit on a Mac (some might say therein lies my problem).
My goal is simply to design a rudimentary implementation of the circuit which I can visualise working
I ...
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113
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How does Apple's ADB's collision resolution work?
I've read several different documentation sources explaining how Apple's asynchronous ADB protocol works. Although quite convoluted, it makes some sense of several rereads. I am having difficulty ...
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411
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Does Apple or Qualcomm do product binning for their SoCs?
It's well known that Intel does product binning with their CPUs — essentially selling the same chip as multiple different chips with different specs and prices based on the tested properties of the ...
- 171
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Apple devices - "Vibrating feel" when charging [duplicate]
I am absolutely not experienced when it comes to electrical stuff at all which is why I hope you can help me out on this one because I am a bit worried right now.
I own a bunch of Apple devices and ...
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1
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428
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Repurpose a MagSafe 2 Charger for USB-C [closed]
Hi Mac Owner here that is now dealing with cable hell...
I have an inexpensive 60W MagSafe 2 charger that I was wondering if I was able to rewire the connector for USB-C. I have experience with ...
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2
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368
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USB Charging Voltage vs Battery Life
I've been running some tests on USB charges from different manufacturers checking voltagem and current.
I noticed that some usb charges do deliver 4.9 to 5.2 volts and from 500mA to 2.4A.
My ...
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1
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171
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How to initiate a Lightning connection
I'm trying to take the first step to establish a connection with an iPhone using the Lightning port. I'm using the Lightning A male connector body, which I believe should set the iPhone to be a USB ...
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How Macbook Pro detects an external microphone through TRRS jack? [duplicate]
An audio port on a MBP is a combination output. If you plug in 4-conductor 3.5mm connector (TRRS) like the one on Apple earbud with microphone, it appears that that port can be use as an input.
I ...
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iPhone schematic help
Could someone help me understanding the markings of this schematic? What the little numbers I circled in red and yellow are.
Is c59 providing power to that entire circled area or is just two points ...
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On an Apple 12W USB Charger, how are the D+ and D- lines configured?
I'm looking for the voltages on the D+ and D- lines of an Apple 12W charger that corresponds to the 2.4 A output.
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How to interface with the Apple Watch for the purpose of accessing its internal memory? [closed]
Unlike other apple products which can be directly connected to a PC via USB, the Apple Watch is completely wireless from the point it exits the factory, as far as I am aware.
Aside from a 6-pin ...
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1
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508
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What is the purpose of this transistor in an Apple Time Capsule?
While taking apart a 2009 Apple Time Capsule, I found a 2N3904 NPN transistor on a 2-wire cable with the emitter connected to one wire and the base and collector connected together and to the other ...
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3
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2k
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Understanding the Apple 1 power supply
I'm trying to understand the schematic of the Apple 1 computer power supply.
Nothing surprising at first sight. Two power transformers (117 VAC -> 10 VAC / 117 VAC -> 28 VAC), two diode bridges, and ...
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1
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How do volume control headphones work?
A recent question over on Android Enthusiasts got me to wondering how volume control headphones work.
I don't mean volume control which works by attenuating the incoming signal, but the kind of ...
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