Stable transistor oscillator

Circuit arrangements are presented which considerably reduce the effect of changes in supply voltage and temperature on the frequency of a transistor oscillator. The oscillators described use n-p-n junction transistors and operate in the frequency range of 1 to 2 mc. In this range, a stability of 10 to 20 parts per million for 10-percent changes in supply voltage have been obtained compared with 200 to 400 parts per million for the same change in unstabilized oscillators.