SU20156A1 - Cathode generator or amplifier - Google Patents

Description

In conventional tube oscillators and amplifiers and amplifiers, combinations of parasitic capacitances and self-induction, which can produce side oscillations, are of great importance. For example, in the usual three-point oscillator circuit, in addition to the primary oscillating circuit 1/0, there are always oscillatory circuits formed by various combinations of the capacitance of the basic oscillatory circuit, its self-induction, the anode-grid and the cathode grid, and the self-induction of the connecting wires .

The present invention relates to a cathode oscillator circuit or: an amplifier operating in a push-pull circuit, and aims to avoid the occurrence of parasitic oscillations, for which the parasitic capacitances noted above are subject to: changing the capacitor njnreM parallel to them, which serve to configure all circuits of the generator or amplifier in this way so that the possibility of parasitic oscillations was / eliminated.

The drawing shows a diagram; the proposed cathode generator and an amplifier in which L and -iz designate lamps operating in two cycles, and bj both anode and grid self-induction. Ci and Cz capacitors are connected directly to the anodes and grids; their capacitances are summed with the anode-grid intra-tube capacitances. Capacitor C3 is connected between the anodes of both lamps and the following capacitances are added to its capacitance: ") the own capacity of the coil Z-i; o) the capacity of the anodes relative to the ground; and) the mutual capacity of the anodes. Condenser 4 is included between the grids; with its capacity is folded: a) the own capacity of the coil 1-2; ) the capacity of the grids relative to the ground and “) the mutual capacity of the grids. The values of i / i and ia are selected according to the wavelength of the generated oscillations and depending on the required magnitude of the effect of the anode circuit on the grid circuit.

The values of the capacitors of the capacitors are chosen in such a way that the following condition is satisfied:

C-i LI.} (LI - {- L,) Cz.

It can be shown that when this condition is fulfilled, the oscillations in the system will be maintained by the lamps only if the phases of the currents in the three circuits constituting the system are consistently opposite, i.e., if in the upper loop LI, C-A counterclockwise, in the middle loop i ,,, Ci, Ca the current should go clockwise, and in the lower loop io, 4 again counterclockwise. This requirement can be satisfied only by oscillation and the desired frequency to which all three circuits are tuned. This eliminates the possibility of any parasitic oscillations.

The circuit depicted in the drawing is a self-excited oscillator; it can also be used as a resonant amplifier with regeneration, for which the voltage to be amplified must be connected to the grid circuit by any known method.

The subject of the patent.

A cathode generator or amplifier, characterized in that the capacitance of the GI and Cz condensers, which are included in the push-pull circuit, are parallel to the intra-tube capacitances of the anode grid, the condenser — C, connected between the anodes of both lamps, and the condenser C — between them, is chosen in such a way to Cg LI

 f, - (Lj - f) LZ Cg, where ii is the anodic ,,. a iv-net self-inind; sci.

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