I would like to understand how colpitt's oscillator works but I'm confused because there are many configurations on the internet and I don't know what is the difference between them.
For the next two configurations, Why are the capacitors C1 and C2 are moved ? They where between the output ( collector ) and the ground and they became between the output and the Vcc.
For the following configuration, I understand it very well because the feedback path is very clear.
Would you tell me where the feedback bath of the previous two configurations is ?
My last questoin is : Why we need to modify the configuaration ? which one is most suitable for radio frequency ? and which one has a stable frequqncy and works without errors ?