Hey, I don't wanted to supress ideas. Ideas are always welcome. I just wanted to give it a more serious direction by having a clear 'must-fulfil'-list.
Thanks JDB!
The DDS approache looks interesting and I'll definitly put it on my 'projects-in-the-future'-list. But for now I think an AD9912 is not the way to go. Not only because of the package. On the internet you can find tips how to solder it at home. But I think it is simply to expensive! We are talking about 88Eur only for the chip. In my university time we always made projects with the best performing stuff but then later in my job as an engineer I learned, that you also have to keep in mind: Is there a market for it or rather are there people who want to spent that amount of money for it. And I think that there are not many DIYer who want to spent ~150Eur only for the parts for the clocking (Maybe I'm wrong). Therefore, I think now it is better to do it in the following way: First make a board with a VCXO driven clock on it providing the clocks either in master mode or locked by a PLL which is only catching fixed rates like 44.1,48,88.2,96,... and not to support varispeed (as JDB mentioned) and later to make a board with DDS on it and supporting then varispeed. But this board will be designed a little bit more complex and will be a project for advanced DIYer. But I can imagine that this board is then also able to work as a standalone master clock like iClock or Big Ben (not thinking about video sync at this moment) because then it is worth the effort and the money because you will get more features.
Raphael
Thanks JDB!
The DDS approache looks interesting and I'll definitly put it on my 'projects-in-the-future'-list. But for now I think an AD9912 is not the way to go. Not only because of the package. On the internet you can find tips how to solder it at home. But I think it is simply to expensive! We are talking about 88Eur only for the chip. In my university time we always made projects with the best performing stuff but then later in my job as an engineer I learned, that you also have to keep in mind: Is there a market for it or rather are there people who want to spent that amount of money for it. And I think that there are not many DIYer who want to spent ~150Eur only for the parts for the clocking (Maybe I'm wrong). Therefore, I think now it is better to do it in the following way: First make a board with a VCXO driven clock on it providing the clocks either in master mode or locked by a PLL which is only catching fixed rates like 44.1,48,88.2,96,... and not to support varispeed (as JDB mentioned) and later to make a board with DDS on it and supporting then varispeed. But this board will be designed a little bit more complex and will be a project for advanced DIYer. But I can imagine that this board is then also able to work as a standalone master clock like iClock or Big Ben (not thinking about video sync at this moment) because then it is worth the effort and the money because you will get more features.
Raphael