SU337902A1 - TWO-FREQUENCY AUTOGENERATOR - Google Patents

Description

Two-frequency harmonic oscillator oscillators are known; there are two transistor oscillators with automatic bias and a transport link between collector and base circuits. The purpose of the invention is to obtain antiphase discontinuous generation at two frequencies, switched according to the law of the third, lower frequency. This is achieved by the fact that the outputs of the base windings, transformers, not connected to the transistors, are interconnected through a capacitor. The drawing shows a schematic diagram of the autogenerator. The transistors of the collectors are connected to transformers, the primary windings of which together with the capacitors constitute the oscillating circuits. Transformers 2 and 3 can be made with open magnetic circuits, forming a magnetic antenna. The secondary windings of transformers 2 and 5 are connected at one end to the bases of transistors 2, and at others to capacitors 4 and resistors 5. Between the ends of the secondary windings, connected to the capacitor, there is a special capacitor 6, the capacity of which, as a rule, should be greater than the capacitors 4. capacitors are similar to the state of a multivibrator. After switching on the voltage, the process of increasing oscillations in both generators is characteristic. Moreover, the amplitude increase rate in one of the generators is greater than in the other. The increase in its bias voltage is transmitted through capacitor 6 to the base of another generator, which, as a result of the process, causes its locking and generation failure. This oscillator is characterized by a condition in which one generator is running and the other is temporarily locked. Over time, the potential at the base of the locked transistor 1 due to the charge of the capacitors 4 through the resistor 5 reaches a value sufficient to open it and self-excitement. The increase in voltage on the circuit due to its rectification at the base transition and transmission through capacitor 6 causes the operating generator to close, the period of which is determined by the constant time of the charging circuits, the ratio of the feedback winding voltage to the supply voltage, and the potential of the transistor /. In this way a cyclic generation process is formed.

auto-shifting auto-generator and transformer coupling of jollator and base circuits, characterized in that, in order to obtain antiphase discontinuous generation at two frequencies, switched according to the law of the third, lower Frequency, through the capacitor.