Crystal Question

[VictorPS]

Sorry this is a stupid question, I know it will not work, but yet I need to confirm the answer.

if I have 2 crystals, 10Mhz and 20Mhz.
What If connect them in
1. series
2. Parallel

what will happend to the output freq?
or it will not work at all?

Thank you,
Victor

 

[Sceadwian]

It wouldn't work, crystal drivers wouldn't be able to handle the drastically changed load. You might be able to get it to work as 10/20mhz are harmonics of each other, but there would be no point in doing it.