Comments on: Modifying a Car USB Adapter to (Finally) Charge My Cell Phone

By: Keith Neufeld

Keith Neufeld — Mon, 18 Jun 2012 11:12:28 +0000

Gabriel, read Adafruit’s article to which I linked. Shorting data pins isn’t sufficient for today’s devices.

gabriel — Mon, 18 Jun 2012 06:55:40 +0000

shouldn’t you just shorted the data pins? that’s how dumb devices are supposed to tell usb devices that they are not a usb host.

anything less than 1kOhm does the trick, according to specs.

Joel — Mon, 30 May 2011 12:19:54 +0000

Brilliant! I’ve got a couple of these that don’t charge things properly, so it’d be great to fix them. Thanks for the information.

Simon C — Sun, 29 May 2011 21:23:32 +0000

That is a classic chip, originally from Motorola, now On semi –
http://www.onsemi.com/PowerSolutions/product.do?id=MC33063A. Many people make an equivalent.

Dave jones has a great video using it,

Karl P — Sun, 29 May 2011 15:58:36 +0000

Good writeup! Well done. I’m glad you looked into it. Unlike David R, I would have been concerned that another device would have the same problems.

David R — Sat, 28 May 2011 21:34:24 +0000

Nice writeup & explanation of debugging a circuit like this…but personally I would have just bought another $1.99 adaptor