Diver Martin <diver.martin@...>
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Just as a point of reference: Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:
1000x 0603 resistors: $2.07
1000x 0805 resistors: $3.03
1000x 1206 resistors: $4.63
1000x axial TH resistors: $7.29.
At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference. (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100). You can really sneeze hard and not loose a lot of money.
On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...>
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
From: Clark Martin <kk6isp@...>
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build
Mouser & Digikey are my go-to for SMT parts. They carry just about everything. If you have other oddball SMT stuff, and either one are out, head to findchips.com
. There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent. Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).
SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.
I’ve only bought from Digikey a few times but I use Mouser all the time. Also there are Newark and Allied for such supplies.
I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF). They came on cards that fit a day planner binder. There are between 1 and four strips of 25 each for each value (depending on expected usage levels). I have little trouble working with 0805 parts and they fit nicely on .1” grid perfboard (with plated through holes).
When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).
I haven’t done any PCB fabricating yet but that is in the plans.
SMD diodes and transistors of most any size are easily soldered to perfboard.
I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.
It definitely makes for smaller boards.
Martin Held - AE7EU
If there aren't any questions, then what is there to learn?