[time-nuts] TNS-BUF order update

Dana Whitlow k8yumdoober at gmail.com
Mon Jun 25 18:39:47 EDT 2018


John speaks of high dissipation, which is a good point.  However, I doubt
that the
lead inductance will be a noticeable factor at 10 MHz unless a leaded part
is
mounted sloppily.

Dana


On Mon, Jun 25, 2018 at 4:04 PM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> The PZT version actually has a higher power dissipation than the leaded
> part. It
> also does a bit better at RF frequencies due to lower lead inductances.
> Not having
> the schematic in front of me, I don’t know if either one is a real big
> deal in this case.
> It has been on other circuits I’ve used them in.
>
> Bob
>
> > On Jun 25, 2018, at 4:56 PM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
> >
> > John,
> >
> > Couldn't the TO-92 part (2N3904) be soldered down instead (if one has
> > steady hands),
> > and work about as well?
> >
> > Dana
> >
> >
> > On Mon, Jun 25, 2018 at 11:58 AM, John Ackermann N8UR <jra at febo.com>
> wrote:
> >
> >> To those who pre-ordered TNS-BUF boards:
> >>
> >> We've had a delay due to parts availability -- a common transistor
> >> (PZT3904) is apparently on worldwide back order with lead times quoted
> of
> >> up to a year.  Our contract manufacturer has finally found a source, but
> >> they will not be delivered until mid-August.  That means that TAPR won't
> >> receive the boards until the second half of September.
> >>
> >> If the delay causes you a problem and you'd like to cancel your order,
> >> please contact the TAPR office (taproffice at tapr.org) and John will take
> >> care of that (though he will be out of town until July 6).
> >>
> >> Sorry for the inconvenience, but we did not want to risk using a
> >> substitute component that might change the performance of the unit.
> >>
> >> John
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