Comments on: DIY hub dynamo usb charger

By: Arend

Arend — Thu, 13 Jun 2013 19:35:53 +0000

I believe they didn’t have it at the time of writing. I bought it in a local electronics part shop.

By: wanda

wanda — Sat, 08 Jun 2013 15:25:34 +0000

For every compenend you linked to the farnell website, which is great.
However for the C5 22uF Tantalum bead, this is not the case. Can you also create a link to the farnell website for this?
I would like to order the components.

By: Arend

Arend — Tue, 04 Jun 2013 14:57:24 +0000

Please share. It’s not like I invented this circuit. The more people use / build it the better.
Thanks for letting me know, good to see it being used!

Regards,

Arend

By: Jacek

Jacek — Tue, 04 Jun 2013 13:02:36 +0000

Hi,
thank you very much for the tutorial, I like it for its simplicity. I’ve just finished my USB charger and it works although I had nothing to do with electronics before. I would like to share this tutorial with other people in Poland if you don’t mind. Do you think that I could translate it to polish? I’d like to show it to people at Bike’s Day in Kraków, so that they see how simple it could be and that advanced knowledge is not essential. Please answer if you have anything against.
Jacek

By: Gareth

Gareth — Tue, 21 Aug 2012 21:02:17 +0000

Hi,
Thanks for the circuit info. I have built it, and it seems to work, but unfortunately only for about 10 seconds, and then the phone stops charging. I’ve tried it on an ipod touch and HTC Wildfire S. Testing with a multimeter and I still have +5V on the USB output, so it seems to be something about the devices I’m charging. I’ve set 2V on each of the data pins to get the ipod to charge as suggested. Would be interested to hear if anyone else has come across this.
Cheers

By: Arend

Arend — Wed, 04 Jul 2012 17:05:32 +0000

Guys, sorry for the late responses but I am very busy. Also I am not that good with electronics, so if anyone else can add something to the questions please do.

By: piccas

piccas — Mon, 18 Jun 2012 20:26:38 +0000

hi, i was trying to change this circuit and adding separate control for the lights, and an extra 9v exit for a sw/mw radio. since i see your project is very similar i would really need a few clues on the best schematics. i am a bit disorientated on wich is the best place to place the battery, since i would only need it when i am not riding. also, i will make this with a bottleneck wich i have measured spinning the weel with the bike upside down and at maximum gave 28V so i think i have to change a lot of the components from this circuit.
the problem is that i’m not too sure on wich components i can be sure to use.
i thought for c1 a few 50V 470uF that i got from old electronics wired in parallel
then from the positive before the 5V regulator i was thinking of placing the 9v regulator wich charges a 9v battery (and a switch before it).

—,–*—,—————–5v—,—,– +
| sw | | |
c1 9v——°, | c2 c3
| | 9Vbatt | | |
—’–*—-’——°———-’—-’—-’– -
where i connect the lights in * and the 9v plug in °
this is just a sketch as you can imagine but any help would be appreciated

By: Anonymous

Anonymous — Mon, 11 Jun 2012 15:24:24 +0000

[...] Today, 03:24 PM Hi there. I want to build this project http://www.arenddeboer.com/diy-hub-d…#comment-11949 And someone has modified it so it charges his 3gs The mod he described as " [...]

By: Andrew Norris

Andrew Norris — Mon, 11 Jun 2012 15:18:04 +0000

This is awesome! I would like to build it for my 3gs. Could anybody explain what is meant by
“[5v+]—(100k)—[D+]—[D-]—(100k)—GND”
As it appears this is needed to make it work on a 3gs?

Is there a name for this terminology, a link which could explain it?
I fear without this my 3gs will not charge. Glad to hear someone got it working!

PS. Hope don’t mind but I asked this before in reply to a comment, but have posted it here as a general comment, so more may read it and perhaps help out with this issue.

I really want to build as will be doing some long distance touring soon on my bike!

By: Andres

Andres — Thu, 07 Jun 2012 22:25:09 +0000

Hi, this DIY project is exactly what I’ve been looking for. I have a question, is it possible to replace the LM2940CT for a typical LM7805 instead?

Thanks!