M
mike
- Jan 1, 1970
- 0
Sensing a local pressure in liquid. It has a DC value and then I'll have
to measure up to 20-30Hz worth of changes. Very cramped space, hence the
0.010" width.
Would be interesting to see the mechanical configuration that gives you
a differential compression force on such a small area with large
wavelengths at 20 Hz. without bending.
Can't argue with that. Money talks!I can't work on bending (which I am aware is the normal modus operandi
of a "singing cap"). I can only work with thickness changes which will
eb quite miniscule. Ideally with capacitance change because the signal
coming out of it via piezo generation is very tiny, at least here on the
bench.
Oh, I've done that a lot
One could buy half a truckload of reels and store them in a gigantic
nitrogen cabinet. That would last nearly forever. But the better method
is to first establish principle of operation. Then it's time to sit down
with a manufacturer. It would not be the first time where the response
is "You want to do WHAT?!". After they heard the Dollar numbers involved
that usually changed to "Oh, wow, let's see how we can do this".
Problem is that it only talks to the original people making the agreement.
When a cap vendor is making a million caps a minute, your puny order
for 10-million caps isn't worth the stamp it costs to reject your request.
And even if you get agreement, the guy's successor will back out
if it helps his bottom line.
I've had situations where the new guy in my purchasing augmented his bonus
by scrapping my "lifetime buy" of specially selected parts. Even if he
wanted to ask engineering, there's nobody left who knows why. I learn
about it after the production line shuts down and nobody wants to source
the "special" part. THAT 2N3904 is exactly the same as THIS 2N3904...
NO, IT ISN'T.
I can tell horror stories until you get bored...which is probably about now.