SU66776A1 - Amplifier limiting telegraph signals - Google Patents

Description

The present invention relates to iK systems that make it possible to convert one-way pulses of low power telegraph manipulation into duplex current pulses of continuous current, which provide high-speed recording by an indulator.

The essence of the invention is that the resistances from which the voltages — feedback, controlling the output lamps to obtain a large limitation slope, and the output voltage — are included in the cathode circuits of the respective lamps: restrictive, control and output.

The drawing is a diagram of the proposed device. In the absence of a signal at the input of the amplifier lamp i / 7i. locked by the voltage Le ,, which is formed on the resistance due to the anode current L-y. When the lamp is locked, its anode current is zero and, therefore, the voltage drop across the resistance /. from the current of the lamp L is absent, as a result of which the lamp L3 is unlocked and the grid of the lamp L2 receives a positive potential (greater than U,) taken from the resistance h. The current flowing in the anode circuit of the lamp Lg creates a voltage drop in the resistance, which locks the lamp L.

Thus, in the absence of a signal at the input of the amplifier L1Mpa Lz unlocked, and the lamp L.1 is locked, therefore, the output lamp LL will be unlocked for. the expense of a large positive potential on the grid, taken from the resistances and Rs, and the lamp Le will be locked, since the voltage drop across the resistance Re is absent; output current / s. loads, passing in the direction of arrow a, creates voltage drops on the resistance RS, which locks: the MPU Lb.

When a positive voltage UB is applied to the input of the amplifier L1, the lamp L1 is unlocked, the current flowing in its anode circuit creates a voltage drop across the resistance, and this voltage locks the lamp Lz. When the lamp is locked, the lamp L is locked and the lamp L, as a result of which the lamp L is additionally unlocked by reducing U d (positive feedback on the DC current). When locking up

the lamp L is unlocked by the lamp L, since the voltage drop across the resistance Rz due to the current of the La lamp is present.

Thus, when a signal is applied to the amplifier input, the Lz lamp is locked, and the L lamp will be unlocked, therefore, the L output lamp will receive a large positive potential on the grid and will be unlocked, and the LB lamp will be banned because the voltage drop on R "Rb is absent, and the output current of the load, passing in the direction of the arrow S, creates a voltage drop across the resistance RT, which also blocks the lamp Lb.

Now, when the signal is turned off, a locking of the la: mpa L occurs, which increases due to the appearance of the current of the lamp L.

Positive feedback acts in such a way that when unlocking the lamp A, it increases unlocking, and when locking it increases the locking.

In the circuit, the feedback is obtained when: the anode currents of the lamps L and L are not the same. A change in the ratio of anode currents (a change in the ratio between RZ and RZ changes the degree of feedback.

The proposed scheme has a large coefficient of current utilization, supplying it with an anodic battery circuit.

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Subject invention

Amplifier-limiter of telegraph signals using positive feedback on direct current, characterized in that the resistances from which the voltage is taken - feedback, controlling the output lamps, and output - are included in the cathode circuit, respectively, limiting, control and output lamps.

-o +/- 2 (75 -120V