Re: PCB Design Kit Questions.
- From: Spehro Pefhany <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 07 Jan 2006 09:44:16 -0500
On 07 Jan 2006 08:51:07 -0500, the renowned DJ Delorie
<dj@xxxxxxxxxxx> wrote:
>
>zwsdotcom@xxxxxxxxx writes:
>> The 33 each deal is a much better buy if you meet the requirements.
>
>And if you need 3 boards.
>
>One of the things most people don't learn about prototypes is that
>they shouldn't try to make them the "final". Expect them to have
>problems; design them to be fixable. That means making one at a time
>until you get it right, *then* looking for volume deals.
I don't consider 3 pieces "volume". It's about the minimum usable if
you're working for an outside client or an internal client at another
location. You want minimum two boards populated (one for you and one
for them) and working and one to ruin or keep around as blank. If you
do field tests, then 5+ is more like it. I find an extra board or two
to be a LOT less irritating than having to pay a second set of
handling, setup and shipping charges to get one or two additional
boards that are essentially identical.
>So, I have a stack of three unusable boards from my 33each purchase,
>and one bare bones that works. Sigh.
I've ordered 500-1,000 boards without a prototype (including
multilayer). Even many hundreds of populated boards without seeing a
prototype. If you strive for ZERO defects and develop a comprehensive
checklist for projects (beyond just DRC and covering all the errors
you've ever made and those you've heard about too) you can get usable
boards almost every time, and the reduced time to market will more
than pay for the rare problem. The biggies IME are hole sizes and
mismatches of schematic pin numbers (or even part pin numbers) to
footprint pin numbers, and using a library footprint without fully
verifying that it is what you think it is.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.
- References:
- PCB Design Kit Questions.
- From: Lacy
- Re: PCB Design Kit Questions.
- From: DJ Delorie
- Re: PCB Design Kit Questions.
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- Re: PCB Design Kit Questions.
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