[time-nuts] Divide by five

Neil Schroeder gigneil at gmail.com
Fri Nov 7 19:30:32 EST 2014

On the topic of SMD/SMT surfboards - has anyone seen one that has pad areas
designed for crystals or oscillators?    Most of the pads are for
resistors, and that might be fine for a crystal in the strictest sense -
just the crystal no resonator - but I have 4, 6, and 8 pad guys here that
just aren't spaced right for that.

If nobody has, will break out Eagle and make an attempt to create one.


On Fri, Nov 7, 2014 at 3:32 PM, Brooke Clarke <brooke at pacific.net> wrote:

> Hi:
> I have some info on working with SMD parts at:
> http://www.prc68.com/I/SMT.shtml
> The key thing is to get parts with a reasonable pitch, 0.1" is a standard
> DIP pitch.
> 0.050" (1.27 or 1.25 mm) is half DIP and is easy to do with a fine tip
> soldering iron and small dia. solder that I normally use for other stuff.
> The use of a stereo zoom microscope or a magnifying glass/light or 3.25
> diopter reading glasses is a big help.
> On eBay there are many "surface mount surfboard" that allow you to mount a
> SMT and then treat it like a SIP so you can use prototyping boards.
> Another option is to make a ring counter out of transistors.
> http://www.prc68.com/I/comp.shtml#Lamp
> The beauty is that each transistor is toggling at 2/N of the clock
> frequency.
> Mail_Attachment --
> Have Fun,
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> http://www.prc68.com/I/DietNutrition.html
> Chris Albertson wrote:
>> On Fri, Nov 7, 2014 at 1:12 PM, Joseph Gray <jgray at zianet.com> wrote:
>>  Can anyone recommend a chip that
>>> is fast enough and comes in DIP?
>> Some SMDs are easy to solder by hand.  Others such as ball grid array is
>> impossible.
>> An easy SMD prototype board can be made by sawing the edge connectors off
>> some old RAM memory or PCI boards and gluing down a parallel row of them.
>> Dead bug style works well with SMD also.
>> We are going to have to get used to working with these.
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