[time-nuts] TNS-BUF order update

Bob kb8tq kb8tq at n1k.org
Mon Jun 25 17:04:35 EDT 2018


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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