[time-nuts] TNS-BUF order update

John Ackermann N8UR jra at febo.com
Mon Jun 25 21:04:14 UTC 2018


Possibly, but I don't know about power dissipation (the PZT has a heatsinking tab, and we run a fair bit of current through it.  And, that would be a hand-sokdering job that would run up the assembly cost.

We do have a source of the part, but we are stuck with the month or so delay.

On Jun 25, 2018, 4:57 PM, at 4:57 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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