https://www.amazon.com/Coolerguys-100-240v-Molex-Power-Adapter/dp/B000MGG6SC... Can you power supply the pc card with the 5v 2a part of the power supply in combination with the 3 way usb otg host charger cable? Thank you.
--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Tue, May 30, 2017 at 8:15 PM, ronwirring@safe-mail.net wrote:
https://www.amazon.com/Coolerguys-100-240v-Molex-Power-Adapter/dp/B000MGG6SC... Can you power supply the pc card with the 5v 2a part of the power supply in combination with the 3 way usb otg host charger cable?
it should do, yes. best way to make absolutely sure is to read the bq24193 datasheet.
l.
Regardless of rating, I wouldn't recommend it. Those are about $5-10 on eBay and they're worth a tenth the price. The last two I bought blew up in a year, and since China never puts much money into them, they don't die alone... whatever they're plugged into when the capacitors happen to burst is almost inevitably, irrecoverably toast as well...
If you're going to use anything with a molex connector on it, get a small ATX12V or SFX12V (standard PC) power supply and use that. You need to find the green wire on the ATX connector (the largest PC-side connector, it'll be 20 or 24 pins depending on the age of the supply) and short that to one of the neighboring black wires. I usually use a paperclip -- it's a logic-level wire pair, that, so anything large enough to make the jump is almost overkill in terms of required AWG size. You could literally use phone-cable wire for that one connection, if you could get it to reliably contact...
also it looks like i'm going to be using the same 4A 7-21v regulator that's on the microdesktop board to generate a stable 5V. actually i'll have to make it 5.3v then add a monster schottky diode in front of it.
long story.
l.
...actually (replying to both myself and to Ron here), if I were going to buy a power supply specifically for an EOMA68 card and I wanted maximum reliability (etc) -- forgive me, but this is what I'd buy...
https://www.apple.com/shop/product/MD810LL/A/apple-5w-usb-power-adapter
Before you tie me to a stout pole and light me on fire, hear me out a minute. I promise I can at least partially justify this atrocity.
First, I hate Apple with both vengeance and passion. Their "we'll out-and-out gouge you because we can get away with it" pricing model for everything makes me foam at the mouth, and their wasteful, "everything is a consumable" attitude makes me just about boil over. Ditto and then some for the closed ecosystem that is their hardware. But they put actual and considerable effort into their products, and for that --and that alone-- they earn my grudging respect. Their interface designs are freakin' beautiful, and their hardware really is designed to be pretty reliable and to last its planned lifetime. They don't cut nearly as many corners as they want you to think. Given that one of the worst tech companies on Earth, and justifiably so, is also one of the most skilled at making what they make -- as the line from The Matrix goes, "fate, it seems, is not without a sense of irony."
Second, read this http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html and then this http://www.righto.com/2012/03/inside-cheap-phone-charger-and-why-you.html. Ken Shirrif is no lightweight in the electronics engineering field. He knows his $#!* and then some -- sure, I know a thing or two about electronics, but I am comatose and braindead compared to Ken. You really do owe him the time to properly read and research-until-you-understand those two posts of his on (respectively) Apple and fake-Apple chargers -- the second of which explains in painful detail why you want to buy direct from Apple, thieving bastards that they are, and not from eBay or Amazon or the like. (Getting a non-counterfeit Apple charger through third-party sellers is roughly statistically equivalent to simultaneously winning two lotteries while being struck by lightning.)
Okay, *now* you can burn me at the stake :P
On Tue, May 30, 2017 at 3:53 PM, Luke Kenneth Casson Leighton <lkcl@lkcl.net
wrote:
also it looks like i'm going to be using the same 4A 7-21v regulator that's on the microdesktop board to generate a stable 5V. actually i'll have to make it 5.3v then add a monster schottky diode in front of it.
long story.
l.
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