SU29515A1 - Generator - Google Patents

Description

Devices are known in which a low-frequency oscillator with an electron tube is excited by introducing a tuning fork or string into a grid circuit. Such generators are called tuning forks or strings and are used to stabilize an audio current (a tuning fork) or for measurements (a string). Here, the frequency of the generated current is determined by its own oscillation period of the tuning fork or string.

The present invention aims to set up an electromechanical vibrator based on a different principle.

In the high frequency generator according to the invention, electromechanical coupling of the grid and the anode at a low frequency is applied for modulation.

A high-frequency electronic oscillator with its own excitation according to the feedback principle, or independently excited, can be, as is well known, modulated by an audio frequency current applied to the grid or to the anode circuit and generated by one of the known methods, for example, a tuning fork with an interrupter driven by batteries . According to the present invention, the modulation is carried out by inserting a low-frequency transformer in the anode circuit of the primary winding, the secondary winding of which is an adventure

on the winding of an electromagnet that attracts one of the forks of the tuning fork. Against the other plug is another electromagnet, the winding of which is included in the grid circuit of the high-frequency generator.

The operation of the device can be explained as follows. The constant component of the anode current, the passage through the transformer winding, causes a current in the secondary winding that causes the fork of the tuning fork to be attracted by an electromagnet. Due to this deformation, the other plug induces a nearby electromagnet e. D. s., acting on the grid of the generator lamp, and in its turn, changing the constant component of the anode current. Thus, in the described device, the automagical low-frequency modulation of the high-frequency current occurs. High frequency can-be stabilized by quartz, etc., by known methods.

Instead of a tuning fork, a string can be applied, the vibration of which can change the capacitance between the string itself and the metal stand. This capacitance may constitute the capacitance or part of the capacitance of the high-frequency oscillator circuit. A change in the capacitance of the oscillating circuit will cause a change in the constant component of the anode current, which in a transformer switched off into the anode circuit will cause the voltage applied to the generator grid. Here are just examples of possible devices according to the proposed principle.

Instead of a tuning fork, metal tongues can be used, etc. The connection of a tuning fork, strings and tongues with a high-frequency generator can be either inductively conductive or capacitive.

Instead of a mechanical low-frequency vibrator, a low-frequency electric oscillating circuit can be used. ,

The main purpose of the described oscillator is to obtain high-frequency modulated oscillations, which are doubly stabilized: at high and low frequencies at the same time for very different practical applications. Prv property in front of usually modulated high-frequency generators - simplicity and economy of lamps. In addition, the described generator can be used as a musical instrument.

The tuning fork can be replaced by a handset membrane, the winding of which is included in the grid circuit.

Another embodiment of the device is the use of low frequency acoustic feedback. A tuning fork connected to the anode circuit through an electromagnet and a transformer is placed in front of a microphone connected in series with its battery to the grid circuit.

The subject matter of the invention.

A high frequency generator, characterized by the use, for the purpose of modulating, electromechanical communication of the grid and anode circuits at a low frequency.