# Eagle components **URL:** \ **Category:** BatchPCB\ **Created:** [February 9, 2005, 6:25am UTC](https://community.sparkfun.com/t/eagle-components/322 "2005-02-09T06:25:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![BigJP](https://avatars.discourse-cdn.com/v4/letter/b/b38774/32.png) [@BigJP](https://community.sparkfun.com/u/BigJP)\ **Post date:** [February 9, 2005, 6:25am UTC](https://community.sparkfun.com/t/eagle-components/322/1 "2005-02-09T06:25:02Z")
I am having a difficult time figuring out what component i need to add. For example there are many different resistors and it took me a while to find out which one i needed. I am now trying to find out where a barrel power connector is. Does anyone have a link to help me out with this?? Thanks ---
**Author:** ![Moore\_Logic](https://avatars.discourse-cdn.com/v4/letter/m/d26b3c/32.png) [@Moore\_Logic](https://community.sparkfun.com/u/Moore_Logic)\ **Post date:** [February 10, 2005, 1:55am UTC](https://community.sparkfun.com/t/eagle-components/322/2 "2005-02-10T01:55:18Z")
BigJP, My experiience with Eagle has taught me not to rely on the supplied libraries. In one case a SOT-23 part had the pins mismapped and I had to cut traces and solder on wires to get my proto up and running, which I had made using the toner-transfer method in my garage. I was using colorful language while I made the modifications. So get the Digikey and Mouser catalogs, select your parts and use the mfg data sheets to build up a custom library. This takes a while to learn, but one you have this mastered, you can use any part you desire and I often reuse the same components over and over so you get a lot of milage from your efforts. Also be sure to make a schematic first and then lay out the board, as Eagle has not let me down is terms of a perfect match between scematic and resulting layout. I bought a book from Borders on building circuit boards that has a tutorial on Eagle that has been very helpful. Jamie