EEVblog Electronics Community Forum

General => General Technical Chat => Topic started by: XOIIO on May 15, 2014, 11:08:35 pm

Title: need an eagle cad library with female USB a type connector.
Post by: XOIIO on May 15, 2014, 11:08:35 pm
Hey all, I'm having trouble finding an eagle cad library with a female USB type a through hole connector, I thought I found one, however the pin order is messed up for some reason, which I figured out after routing out the traces.

(http://i58.tinypic.com/2uhrds4.jpg)
Title: Re: need an eagle cad library with female USB a type connector.
Post by: Hideki on May 15, 2014, 11:29:21 pm
Try PN87520-S in the con-berg library, or better yet, learn to make your own.
Title: Re: need an eagle cad library with female USB a type connector.
Post by: XOIIO on May 15, 2014, 11:40:27 pm
Quote from: Hideki on May 15, 2014, 11:29:21 pm
Try PN87520-S in the con-berg library, or better yet, learn to make your own.

Ah, thanks, no clue why that one didn't show up when I was just searching "USB"

I might try making my own parts sometime, but I'd have to find appropriate models for raytrace if I wanted to render it.

edit: there, much better.

(http://i61.tinypic.com/5kr3ug.jpg)

For those interested it's a little USB breakout with a DIP switch letting you turn on or off each connection, if you turn off VBUS you can use a multimeter to monitor current.
Title: Re: need an eagle cad library with female USB a type connector.
Post by: Stonent on May 16, 2014, 12:50:44 am
I've used a sacrificial cable for that before. I just cut the red wire and splice in the multimeter.

I was troubleshooting a USB device that was needing to be frequently reset because it would drop out.  The vendor said some computers would not be able to give it enough current and it would stop working.  My testing showed it only was using 360mA which is below the 500mA requirement for USB. But the problem didn't resolve itself until the vendor sent me an add-on power supply for it.
Title: Re: need an eagle cad library with female USB a type connector.
Post by: XOIIO on May 16, 2014, 01:35:30 am
Quote from: Stonent on May 16, 2014, 12:50:44 am
I've used a sacrificial cable for that before. I just cut the red wire and splice in the multimeter.

I was troubleshooting a USB device that was needing to be frequently reset because it would drop out.  The vendor said some computers would not be able to give it enough current and it would stop working.  My testing showed it only was using 360mA which is below the 500mA requirement for USB. But the problem didn't resolve itself until the vendor sent me an add-on power supply for it.

I've done that to, but having a more robust solution will be handy, and it will have hooks if you wanted to hook a scope probe onto it.