crystal osscillator - for low voltage supplies

(al crysta • voltage supplies It is very easy to construct a crystal oscillator using a field effect transistor. This particular circuit oper- ates at relatively low supply voltages, from 1.5 volts upwards, and was tested in the Elektor laboratory with common-or-garden quartz crystals with fre- quencies ranging from 100 kHz to 10 MHz. gate The crystal is connected between the drain andn th 1, and operates ie of the field effect transistor, T il L1 i included to parallel resonance mode. Cos oscillator ...for low improve the frequency range. Furthermore, it helps as an additional parallel coil for those crystals which are not particularly suited for this application and which do not feel like oscillating. Capacitor Cl is the series "padding" capacitor for the crystal. The ° phase shift is necessary feedback and the 180 provided by the internal input and output capaci- tances of the F ET. The output signal is buffered by transistor T2. In the laboratory, this circuit was tested wi...