[time-nuts] Divide by five

xaos xaos at darksmile.net
Fri Nov 7 19:59:42 EST 2014


As far as I'm concerned there are no more DIP parts.
However, let's not give up yet. Although
I am not a high volume manufacturer, I found
a nice way around it.

First, forget about prototyping by hand. That
ship has left.

So, I use OrCAD/Cadence (CIS/PCB Editor)
from the start in order to create
a proper project. This includes circuit and board.
OrCAD is fantastic in that you can have
revisions, simulation, etc, etc...

Then I use http://pcb123.com/ to make myself a
protoboard (or 4). Pretty cheap for
that volume. ~$50

Then to mount the components, I use
http://www.pnconline.com/
 
I can usually make 2-4 protoboards
for ~$200-300 with all the components.
Depends on count.

OK, so not exactly old school but
I have a very nice prototype. OrCad
also does amazing simulations
on diff pairs, and other cool things.

Ultimately, by thinking of these things ahead
of time and doing the design right I end up saving
considerable time.

On the prototypes, there is usually a few extra
SMD pots but that's ok.

Let's face it. DIPs are done. This is the way now
and we might as well get used to it.

Anyone here who needs help with OrCad,
just ask. I am sure there are a few experts here
as well.

Thanks for listening,

-George, N2FGX

On 11/07/2014 07:37 PM, Bob Camp wrote:
> Hi
>
> 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
>
>> On Nov 7, 2014, at 4:12 PM, Joseph Gray <jgray at zianet.com> wrote:
>>
>> I need to divide a 125 Mhz clock by five. I have looked on Mouser and every
>> chip I find is either obsolete or in SMT. Can anyone recommend a chip that
>> is fast enough and comes in DIP?
>>
>> Joe Gray
>> W5JG
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