[time-nuts] TNS-BUF order update

Bob kb8tq kb8tq at n1k.org
Mon Jun 25 19:19:05 EDT 2018


Hi

If it’s used in a grounded base configuration, it does indeed matter …..

Bob

> On Jun 25, 2018, at 6:39 PM, Dana Whitlow <k8yumdoober at gmail.com> wrote:
> 
> 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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