[sdiy] Need help with a SMD kit (OT?)

[Neil Johnson]

Hi David,

> On a side note, anyone know the state of SMT resistors these days?  Are
> there choices that are as good as 1/4 watt metal film through hole parts for
> noise performance?  Googling only seems to turn up older articles and
> discussions.

The noise I believe you are referring to is "excess noise"?
Generally, you want solid conductors (metal film, metal foil, thin
film SMT) not aggregate materials (carbon comp, carbon film, thick
film SMT) and the larger the better, although exact choices depend on
the application (e.g., low-value SMT resistors can suffer distortion
due to thermal modulation).  I've seen SSL use metal-film MELF
resistors in their 500-format modules in the audio path.

Here's an interesting read:
https://dcc.ligo.org/public/0002/T0900200/001/current_noise.pdf

A thread on SMT component noise:
http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=401

Cheers,
Neil
-- 
http://www.njohnson.co.uk