[sdiy] Digging into Eagle, resistor package sizes, etc.

[thescum at surfree.com]

>So, there's various sizes, like 204, 207 309, 411, 414, 613... what 
>corresponds to the bog standard through-hole 1/4" watt resistor?

Those numbers are very loosely the measurements in millimeters, then apparently thwacked back to imperial units.

(I think the difference between the US and EU libraries is that the US ones work on .1" spacing, while the EU ones are in mm)

0204 is 1/8 watt
0207 is 1/4 watt
0309 is 1/2 watt

>Also, there's choices of how far out you want the leads to go, like
>207 has a choice of total widths of 7, 10, 12, and 15 grid spacings... 
>what do people prefer?

0207-10 is an easy size to work with for synths, 0207-7 means you'll have to fold the leads tight along the body.  0207-2V is the standing one for tight spaces (stompboxes, discrete opamps).

>There's a bewildering variety of capacitor types. If one hasn't 
>particularly picked out a particular cap in advance, are there good 
>"generic" choices?

In the RCL folder, look at CPOL-US/CPOL-USE for 'lytics, CPOL-UST for tantalum.
Also check C-US/CUSxxx-yyyXzzz for ceramic/poly footprints.

You'll need a datasheet from the vendor to really sort them out...I made my own libraries (copied and edited from the RCL/US components) for my usual Xicon lytics and poly caps.  I give them the value in the component name to make things easier.

Byron Jacquot