Astable multivibrator having a sweep frequency stabilized by a crystal oscillator

Claim 1

Astable multivibrator circuit having a sweep frequency stabilized by a crystal oscillator, said circuit comprising an astable control multivibrator having first and second transistors each having emitter, collector and base electrodes; crystal oscillator means coupled to said control multivibrator for stabilizing the sweep frequency thereof; a bistable complementary multivibrator having third and fourth transistors complementary to the first and second transistors of said control multivibrator and connected to the collector electrodes of said first and second transistors, each of said third and fourth transistors having emitter, collector and base electrodes, means connecting said third and fourth transistors in mutual feedback relation with elimination of interpolation of components; a source of supply voltage; a first resistor, the emitter electrode of said third transistor being connected to the base electrode of said second transistor via said first resistor and being coupled to said source of supply voltage; and a second resistor, the emitter electrode of said fourth transistor being connected to the base electrode of said first transistor via said second resistor and being coupled to said source of supply voltage, the collector electrode of each of said third and fourth transistors being directly connected to the base electrode of the other.