Hi Crutschow,
I'm afraid that 'Parts Express' url just brought up a 404 for me,
but i did find some 'Velleman Oscilloscopes' on the Maplin site
**broken link removed**
However, i am not likely to spend anything like that sort of money on this
project, as it will be only for displaying the engine vibration pattern
for me to examine from time to time.
And probably compare with previous displays, to look for any bits that
might be getting worse.
The 'analog.com' page looked much more interesting.
I had not considered accelerometers, i was thinking of using small microphones,
like the ones in mobile phones and such.
However, microphones like that might be very susceptible to oil, maybe these
accelerometer chips are tiny, like transistors, and maybe they wouldn't be
susceptible to the oil and diesel on the engine.
I will try to check that out.
I have been giving quite a bit of thought to the synchronising.
As want to compare the display at intervals, probably over long periods, then
i want to make sure that it isn't going to synch up to something else at a
later date.
Also just to make it interesting, i want it to sychronise nicely over a wide
range of engine revs.
So i was thinking of making a device to drive the horizontal positioning
directly driven from the cam-shaft. Or some other part that runs at half
engine revs.
Unless theres an easy way to get the horizontal sweep to follow the engine
revs, and also stay the same length.
I'm kind of assuming a CRT is about the easiest option here.
John