[time-nuts] Prototype boards. Was: Re: Divide by five
dan at irtelemetrics.com
dan at irtelemetrics.com
Sat Nov 8 02:27:32 UTC 2014
Hi all,
I completely agree here. Dip parts are so 'old school'! :) You do get
a much better board layout with SMT components. I do understand it can
be difficult for some to solder these new SMD components. However with
good magnification, a little liquid or paste flux, and some tweezers, a
lot of you may be surprised how quickly you'll pick it up.
As for the cost of the prototype boards, there is a board sharing
site worth looking into. For any of us wanting to 'try something',
OSHpark.com is a community circuit board order site. They have great
prices, if you don't mind purple boards! Silk screen, solder mask,
through hole vias, and any shape, 2 or 4 layer boards, with gold
plating. They work well with Eagle, if you have it. (FYI, I have no
affiliation to them, just used them a few times in the last few
weeks...). The really nice thing is if you make a board and others
want it you can 'share' the board. Then anyone can order it for
themselves.
For example, I did a layout of an SMT version of Warren S's HP10811
outer oven controller (Thanks again Warren!), with some extra stuff
added and received three boards shipped, for a total cost of $10 (Not
per board, for the whole order and shipping!). Other boards I have
ordered were $1.30 and $2.80 (Synergy GPS connector boards, etc.) for
sets of three shipped. (Yeah, postage should be more than 1.30!)
Don't completely knock surface mount until you try it. SOIC size
packs, and 0805 and 1206 passive components can be pretty easy to work
with! Eventually you'll start to think .5mm spaced leads, 0603 and
0402 passives are too big! :)
Dan
>
> The days of DIP parts are drawing to a close. Most of the DIP’s are
> now surplus and stocked by odd places here and here. The risk with
> many places (even major names) is that the part you get isn’t what
> you think it is. It may be a re-labeled something else pulled off a
> board in China with a blowtorch. I think that in a lot of ways, you
> are better off with something in one of the larger SMD packages than
> a surplus / questionable DIP. The other half of the equation at
> higher frequencies is good layout. That sort of forces you in the
> direction of a pc board. Custom boards are now so crazy cheap that
> doing them for a one off makes sense. Bob
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