Bruce Griffiths wrote:
Magnus Danielson wrote:
John Miles wrote:
Interesting! 500 picoseconds is a lot of drift. Can you try 74AC390s as
well?
While that may be interesting, I think we should stop here and think a
little... where would a seemingly stable oscillation/beat frequency
with a period of about 1250 seconds (4 cycles in 5000 seconds) come
from? Also, it is being triangular as noted by Brian. The only thing I
can come up with from the top of my head is power or temperature related.
The relative quietness of the TADD-2 was nice to get confirmed. I have
not yeat had the time to measure that with mine.
Cheers,
Magnus
Diurnal temperature variations convolved with A/C cycling?
Could be it.
Alternatively modulation of the 5V Vcc supply (150mV pp) with a 22
minute period would also produce the same effect.
Seems less likely. I was pondering if the power line frequency was doing
some nice beat frequency with the system... but I don't expect it to be
that stable or having an impact like that. AC cycling seems much more
likely. However, there needs to be an AC there or anything else doing
such cycling. A fridge may also do it.
Cheers,
Magnus
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