On Mon, 1 Mar 2010 22:50:29 -0800, Donald Tillman <d...@till.com> wrote:
> This particular project uses some analog IC design styles implemented > with hand-matched discrete transistors; diff amps, current mirrors and > so forth. So I'd need an efficient way to hand-match surface mount > transistors. With TO-92's I can just slap them into a rig and collect > them into batches. Surface mount? I dunno. Do they even make SOT-23 > sockets? The usual approach is to buy SMT packages containing 2 or 4 transistors on a single piece of silicon (i.e. literally back-to-back on the wafer). They're invariably well-matched enough for all but the most ultra-precise applications, in my experience. These devices are used in designs for mass production, where manually matching the transistors wouldn't be practical. Peter -- Peter Brett <pe...@peter-b.co.uk> Remote Sensing Research Group Surrey Space Centre _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user