[time-nuts] Vaperware Parts and pulse stretching circuits

[Robert DiRosario]

You can also get it from Universal-solder in Canada:

ebay: 
https://www.ebay.com/itm/Real-Time-Clock-DS3231SN-for-Arduino-32kB-EEPROM-I2C-Battery-Backup/263183091193
C $4.92 Approximately US $3.49

Or from the web site:
https://www.universal-solder.ca/product/rtc-real-time-clock-ds3231-32kb-eeprom-i2c-interface-cr2032-arduino/
CAD 4.56

Unlike Adafruit, in NYC, Universal-solder, in Canada, is open.

I have one on the way.

I've bought stuff from them before, no problems, same for Adafruit.

Robert

On 04/25/2020 01:04 PM, Ben Bradley wrote:
> Adafruit and Sparkfun sell a remarkable number of SMT parts already on
> breakout boards for moderate prices. I looked up the three parts and
> found the DS3231 on a board (two different boards even), in stock and
> ready to order from Adafruit (most Adafruit and Sparkfun products are
> also sold through Digikey):
> https://www.adafruit.com/?q=DS3231
>
> These links bring up the others, each site has hundreds:
> https://www.adafruit.com/?q=breakout
>
> https://www.sparkfun.com/search/results?term=breakout
>
> On Fri, Apr 24, 2020 at 7:47 PM John Ackermann N8UR <jra at febo.com> wrote:
>> Hi Perry --
>>
>> The circuit in the FatPPS is really simple and would be easy to duplicate.
>>
>> Frankly, the reason we had to significantly increase the cost is because
>> we provide the board fully assembled (it's all surface mount parts), and
>> with the low volume we've had in the last few years, the per-unit
>> assembly cost has gone way up.
>>
>> John
>> ----
>>
>> On 4/24/20 7:19 PM, Perry Sandeen via time-nuts wrote:
>>> Learned Gentlemen,
>>> Several poster wrote:
>>> TAPR offers a FatPPS kit to stretch the pulse out, and it looks likethey're back in stock. I have one but haven't assembled it yet.https://tapr.org/product/fatpps-pulse-stretcher/
>>>   OK no problemo. But it's $55. It's probably a great device, but does this application warrant such expense?
>>> I looked up *pulse stretcher circuits* and found over a dozen inexpensive circuits.
>>>
>>>
>>> DRV8662and is available from Digikey for $3.35. It is a small-pitch device(0.5mm) but not impossible to solder.
>>>
>>> RV-3028 is 3.2x1.5 mm in size, 1.5ppm, additionally trimmable, 45 nAstandby current, under $3 USD in price and in stock at Mouser andDigikey.
>>>
>>> Aswonderful as the DS3231 is, there is a newer chip from Micro Crystalthat is smaller, more accurate than the DS3231M, much cheaper, anddraws less power
>>>
>>> These three chips fall into the *Vaperware Parts* category. Yes, they are great chips and I don't mind someone posting their advantages.
>>> I believe It is a bit disingenuous to say: *It is a small-pitch device but not impossible to solder*.
>>> Really?  If you've dropped $750 to $1K for a stereo microscope and other specialized soldering equipment then you can probably do it without too much difficulty.  Or some may access to such specialized equipment.
>>> But for us *Po Folks* hobbyist we have to stick with older but larger parts.
>>> Now if there was a service where you could order the part soldered to a breakout board with .1 inch breakout pins for say, $20 then using many of the latest chips would be feasible.  But until then I believe 99.9 percent of us have to find a commercial product or some other workaround.
>>> Regards,
>>> Perrier
>>>
>>>
>>>
>>>
>>>
>>>
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>>
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