- USB Chargers - 3 Updates
- What type of capacitor should I use? - 5 Updates
| sam@repairfaq.org (Samuel M. Goldwasser): Aug 15 03:41PM -0400 >> from the Apple store to compare. ;-) > If it's just a 5V supply you could buy a Phihong wall wart for ~$15. > You'd have to re-wire the plug. Yes, of course, or less from MPJA. > How much is the charger from the apple store? (If you don't mind my asking.) 12 W charger is $19 delivered. It just arrived and tested very similar to the one I bought on eBay as "Genuine Apple 12W Charger". Labeling slightly different, but consistent with acceptable variations. Gold and silver refer to the USB contacts. Rated |<--- Volts (V) with Load R of --->| ID Description Max I | NL 10 5.0 3.3 2.5 2.0 | ------------------------------------------------------------------------------ 1 Apple 5W A1265 Gold Pins 1.0 A 5.03 5.01 4.98 -- -- -- 2 Apple 5W A1265 Tin Pins 1.0 A 5.01 5.00 4.97 -- -- -- 3 Apple 10W A1357 Gold Pins #1 2.0 A 5.06 5.03 4.96 4.94 4.92 -- 4 Apple 10W A1357 Gold Pins #2 2.0 A 5.04 4.96 4.95 4.94 4.90 -- 5 Apple 12W A1401 Gold Pins 2.4 A 5.11 5.08 5.06 5.03 5.02 4.92 6 Apple 12W A1401 Tin Pins 2.4 A 5.11 5.09 5.07 5.05 4.98 4.97 #5 is from Apple Store, $19, #6 is from eBay, $7. Have sent off to be X-rayed. ;-) -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
| Jeff Liebermann <jeffl@cruzio.com>: Aug 15 07:09PM -0700 On Tue, 15 Aug 2017 15:41:47 -0400, sam@repairfaq.org (Samuel M. Goldwasser) wrote: >Have sent off to be X-rayed. ;-) Nice. You might find these articles (from 2012) useful: "Apple iPhone charger teardown: quality in a tiny expensive package" <http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html> "Tiny, cheap, and dangerous: Inside a (fake) iPhone charger" <http://www.righto.com/2012/03/inside-cheap-phone-charger-and-why-you.html> "A dozen USB chargers in the lab: Apple is very good, but not quite the best" <http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html> "Macbook charger teardown: The surprising complexity inside Apple's power adapter" <http://www.righto.com/2015/11/macbook-charger-teardown-surprising.html> Patent: Flextronics Integrated power converters <https://www.google.com/patents/US7978489> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| bruce2bowser@gmail.com: Aug 16 04:08AM -0700 On Tuesday, August 15, 2017 3:41PM, s...@repairfaq.org (Samuel M. Goldwasser) wrote: >Have sent off to be X-rayed. ;-) I hope they don't lie to you. |
| Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local>: Aug 15 08:14PM -0700 On 08/09/17 19:47, Jim Mueller wrote: > Go to the manufacturer's data sheet for the capacitors you want to use to > see if their characteristics match the application. ack on that. it's always good advice to see the data sheet. Somewhat recently, I bought some 500V 0.047uF ceramics that I use for high freq bypass in a 400V power supply. I checked, it's X7R. no problems noted. (got them from digikey along with others) but yeah, the part selectors don't give you a whole lot of choice for capacitors at voltages about 100V, sometimes. Still, I've never had a problem with what I've purchased that way. -- your story is so touching, but it sounds just like a lie "Straighten up and fly right" |
| Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local>: Aug 15 08:20PM -0700 > Not much of anything made in China is a quality item actually, I'd think that you just have to be careful and pick a reputable manufacturer. -- your story is so touching, but it sounds just like a lie "Straighten up and fly right" |
| Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local>: Aug 15 08:21PM -0700 On 03/10/17 05:34, Foxs Mercantile wrote: > There's that magic word "feelings" again. Based on nothing. yeah, 'Feel' the 'F' word. so many bad decisions are made in the name of 'Feel'. |
| Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local>: Aug 15 08:24PM -0700 On 08/09/17 19:47, Jim Mueller wrote: > It will be tough to find good ceramics in the values listed with voltage > ratings high enough for tube gear. Polyester (Mylar) or Polypropylene > are better choices. that might be in a lot of cases. I haven't had that much trouble, but price DOES go up rather fast as the rated voltage increases. I'll consider mylar/poly capacitors also, test, see what happens. |
| rickman <gnuarm@gmail.com>: Aug 16 01:53AM -0400 Big Bad Bob wrote on 8/15/2017 11:21 PM: >> There's that magic word "feelings" again. Based on nothing. > yeah, 'Feel' the 'F' word. so many bad decisions are made in the name of > 'Feel'. Once you learn about human reasoning you will find it *always* comes down to feelings. You may have conditioned yourself to weight your feelings on "logic", but it still comes down to feelings and we have ways of working around the logic when we want to. As you say, too often we take a bypass based on some limited experience or even anecdote we've heard that gives us a "feeling" with little rational process behind it. See a couple of bad capacitors from any given company or category of supplier and a strong bias develops which works to bypass that source. -- Rick C |
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