Hi The mounting points are the standard locations for a flexure bar running the resonance along it’s length. The sandwich blank is a bit unique.
The normal gate feedback style circuits will get the crystal running. The impedance will be quite high, so you will need a bit of gain. At low frequencies, a CMOS input op-amp will do the trick. Bob > On Jan 10, 2015, at 12:24 PM, David J Taylor <[email protected]> > wrote: > > Hi David yes I think I have seen similar but not as low as that. If you > compare the suspension points the different vibrational mode should > obvious.....the suspension point is at a node. I think some of these are > quite difficult to excite, I have not seen any suggested circuits but I have > not looked too hard. > > Alan > ==================================== > > I uploaded a couple of pictures taken with the 'phone. > > http://www.satsignal.eu/Radio/2015-01-10-1700-54-crop.jpg > http://www.satsignal.eu/Radio/2015-01-10-1702-51-crop.jpg > > The first photo shows the size and mounting points of the crystal. The > crystal itself appears to be a two-layer structure. The second photo shows a > detail of one of the mounting points. The gold plating appears to have been > scraped away at the edge, and some sort of solder join made at the edge. I > might be able to do a better image with a different camera, but I don't know. > > Hope that is of some interest. > > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
