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 <[email protected]> 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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