SU10524A1 - Telephone control room device - Google Patents

Description

The present invention relates to a device for a dispatching telephony. It has the purpose of increasing the range and amplification of a hands-free reception by using a two-lamp terminal amplifier operating on electron micro-DC lamps, which, as you know, require anode voltage from 20 to 30 volts.

The drawing shows a circuit diagram of an amplifier consisting of a VTR input transformer, an R resistance, an L and L electronic tube, an LTR junction transformer, and a glow resistor. The anodes of both lamps are connected in parallel; The primary winding of the MFR transformer transformer is connected by one Condo to the anode center, and the other is connected to an additional network C of the first electron tube L, so that, according to the inventor, the amplifier uses the principle of regeneration. The other winding of the JTTP transformer is connected at one end to the grid C of the electron tube. At its other end to the secondary winding of the input transformer BTP. The working grids C, O of both lamps are negative.

bias potential. The way to turn on the battery, line and phone is shown in the drawing.

The electrical oscillations of the telephone frequency coming from the line to the primary winding of the ETP input transformer induce a variable electromotive force in the secondary winding of the same transformer, as a result of which the potentials of the working grids C and C of e.ktronnyh lam. and JL alternately have plus or minus, which in turn causes changes in the anode and grid currents in the electron tubes. Thus, the amplifier operates in a push-pull pattern with the peculiarity that alternately imposes additional potency. 1 on the grid Cr of the electron tube Jf and the grid C of the lamp L so that the signs of the potentials from the input transformer BTR and intermediate / 7TP have the same sign ( plus or minus). The cobbers - potentials are amplified in the lamps and cause a change in the anode current acting on the telephone connected to the anode circuit of both lamps, amplify .1.

Predmet patent.

A telephone control room device characterized by the use of a two-tube amplifier with tetrodes, the anodes of which are interconnected in parallel and connected to one end of one of the windings.

the PTR transformer, the other end of which is connected to the grid of one of the L-tetrodes closest to the thread, the other winding of which transformer is connected at one end to the tetrode grid L, and the other end through the VTR input transformer to the tetrode of the L closest to the anode