[time-nuts] 4046 variations (was EPE GPS....)
Lux, Jim (337C)
james.p.lux at jpl.nasa.gov
Sun Sep 27 15:13:09 UTC 2009
On 9/27/09 7:22 AM, "Javier Herrero" <jherrero at hvsistemas.es> wrote:
> Margina design? ;) Better said, very poor design.
> Does not sound very good that same part, same lot code, sometimes work
> here but not there, sometimes does not work at all... Extending it a
> bit... sometimes will work at a given temperature, sometimes will not at
> a given other.
> Robert Atkinson escribió:
>> The old King Radio (then Bendix-King now part of Honeywell) Silver crown
>> aircraft radios used 4046's in some of the synthesisers.
Not always marginal or poor design. Sometimes, you can't get the
performance needed with (any) part that simply meets the datasheet specs, so
hand selection is needed. Picking matched pairs is a time honored method
for instance.. In some cases, the mfr does the picking for you (RF power
transistors). In another case, there's an extremely low noise FET used in
some charge amplifiers that not only has to come from one mfr
(notwithstanding the 2N JEDEC number) but you want to buy a bunch and pick
the quietest one. High value resistors and leakage currents also come to
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