[time-nuts] The ultraAtomic clock for home

jimlux jimlux at earthlink.net
Sat Apr 8 00:18:55 EDT 2017


On 4/7/17 6:25 PM, Bob kb8tq wrote:
> Hi
>
>> On Apr 7, 2017, at 7:19 PM, jimlux <jimlux at earthlink.net> wrote:
>>
>> On 4/7/17 3:45 PM, Charles Steinmetz wrote:
>>> Bob wrote:
>>>
>>>> The epoxy over wire bond construction approach
>>>> is low cost, and not very experimenter friendly.
>>>
>>> It is also extremely unreliable, particularly WRT environmental effects
>>> such as temperature changes, humidity, and atmospheric pollutants.  In
>>> my view, it is unsuitable for use in anything but dirt cheap, purely
>>> disposable devices like greeting-card audio players and disposable cameras.
>>>
>>
>> Interestingly enough it *is* used in space flight hardware.
>
> Humidity does not tend to be a big issue once you get in space :)
>
> Bob
>

Yeah, but you sit for years on the ground waiting, in tropical areas no 
less.


>>  It is much less expensive, lighter weight and easier to inspect than thick film hybrids and similar schemes.
>>
>> You can can do a pre-cap inspection, then apply the potting material, and then you could even xray it to see if the bond wires moved or something.
>>
>> A flipchip with a blob is even better.
>>
>> It's even reworkable (e.g. you can soften the blob & solder and scrape the die off and bond a new one down).
>>
>> I suspect that there is a wide variation in the material you blob on there and so forth.
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



More information about the time-nuts mailing list