Klaas Robers wrote:Crystals can vibrate in quite some different ways. Some of them may emit accoustical waves into the medium where it is in, some others don't. I assume that the cystals that are used for PAL delay lines do (other wise it will not work). So focus first on those. You have a thin glass delay line, try to detatch the crystals from it. Then you get experience in how to do that.
Good luck.
Klaas i am in 2 minds about the delay line i found about 5 or 6 of them in my junk box pretty much similar to the one below
Ultrasonic delay line from a color TV (delay time 64µs), showing path of sound waves (pink) and transducers (yellow, upper left)
Now i know where the signal gos in and where it comes out feeding in a 4 mhz carrier and testing the out put i will see if i can get any thing out of it ..I had tried to use it a while back as a like a crystal but got no oscillations i could detect i just noticed some one has done this already with testing the signal in and out side of it ...
below 2nd video in the blog
https://www.eevblog.com/forum/blog/eevb ... ines-work/I am not really understanding as if the delay line is glass there must be a crystal for the tiny connections on the in and out connections it would be so small not useful here in the supersonic's to move any mass such as a liquid ...If the block is all quartz due to where the connections are its a crystal that cut at a different angle and again i don't think these newer ones will vibrate on the flat sides ...its different to a timing crystal as they do .
I am also wondering about the size factor the 30s jeffree cell crystal was large for sure but it would have to have been not much thicker than todays crystals due to its frequency ..high frequency its thin low its thicker ...may be adjusted to a lager size its mentiond on chris longs site its 1/100th inch thick sound more or less like todays crystal just larger the crystal is a x cut ...
http://www.rfcafe.com/references/popula ... ronics.htmSo thats the only thing i have ....no way of telling what today's crystal are cut to but i do know due to the experiment's i have carried out they do oscillate a mass to .......what written below
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So pretty much are just smaller version's ,it must be easier to vibrate a smaller mass a smaller crystal than a larger one ...here i am confused as the Mr jeffree's circuit i have copied should do a better job of moving a smaller crystal i am using .....factors that are different it was mentioned that you could use 7 or 14 mhz crystal i am a bit lower here but i would again thing using a lower frequency the effect would be easier to do ...another factor is the Valve used ,i have no idea what he used apart from it was a older valve but not much older think mines 40s ...
I do see an increase supersonic waves in the liquid with an increase on voltage to the oscillator ..but i am close to the working max plate voltage 400 volts i think ..that's why i was thinking of a amplification stage after the oscillator ..
Those experimenting with the crystals apart from Jeffree cell but also in liquids had oscillators with High frequency transformers from 0 to 3000v across the crystal to drive them variable to use different frequencies .
So back to the delay line klaas i will look more into it as i am no expert on them and i know you are .
I would on the timing crystal side like to get my hands on vintage ones but ones i have seen are only in the khz range so far ...these old ones i think also mention its cut
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.