[time-nuts] Pulse stretching circuit

[Didier Juges]

If you want to build a simple pulse extender, the design linked below is
derived from the one in my TBMonitor kit:
KO4BB.com/getsimple/index.php?id=pulse-extender

It is not full featured like the one from TAPR but may be enough for your
needs and will cost you much less.

You can get the PWB directly from OSHPark and the few parts from Digikey or
your favorite distributor.

Didier


On Fri, Apr 24, 2020, 6:20 PM Perry Sandeen via time-nuts <
time-nuts at lists.febo.com> 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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