Hi Roughly (very roughly) speaking, the series combination of C1, C2, C3 and L1 should equal the load capacitance of the crystal. If there is a varicap, it’s likely in series as well. If the crystal is cut for series, then L1 resonates with the caps in series.
You can put it on a Spice program and get more accurate results. Bob On Apr 23, 2014, at 10:23 AM, [email protected] wrote: > Hi, > I'm currently playing around with crystal oscillators (specifically a > homebrew OCXO) and came across the Wenzel low-distortion crystal oscillator: > http://www.wenzel.com/pdffiles1/pdfs/xtalosc.pdf > > This uses an inductor (L1) to trim the crystal frequency, with the note that > a varactor/varicap could be added to allow the frequency to be trimmed > electronically. > > Has anyone built one of these oscillators? > > How would you pick a value for L1? I've been reading up on other crystal > oscillator types (Colpitts, Clapp,...) and have yet to find anything which > uses this style of frequency trimming. > > Where would I add the varactor if I wanted to add EFC? Across C3? > > Thanks. > -- > Phil. > [email protected] > http://www.philpem.me.uk/ > _______________________________________________ > 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.
