The two oscillator circuits underneath are ideal for working with crystal oscillators in series or parallel manner: Higher-repetition-amount and significant-energy picosecond regenerative amplifier determined by only one bulk Nd:GdVO4 crystal A timing reference incorporating just one-crystal-silicon micromechanical resonator with an outstanding variable of bigger than a million and al... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html