CS271074B1 - Integral noise suppresor determinated for tape recorders - Google Patents

Abstract

The integral noise suppressing device for tape recorders contains feeding terminals (19,22,26), an input terminal (6) connected in series with two identical frequency dependent circuits (1,2) each of which simultaneously contains a field effect transistor (3,4), a voltage amplifier (5) and an output terminal (7). Into the noise suppressing resistances (40,41,42,43), adaptive field effect transistor (11), current generator (18) and two identical parts are installed. Each of these parts contains an adequate dividing resistance (20 and 21) and a voltage monitor (12,15). The voltage monitor (12,15) has an adequate complementary pair of transistors (28,29 and 36, 37), two filed-controlled transistors (23,24 and 32,33) and four current generators (25,27,30,31 and 34,35,38,39). There are also external condensers (44,45) in the suppressing device over which the output clamps (14 and 17) are connected to the transistor (3 and 4) closures. The block outputs (9 and 10) are connected to the closure by resistors (20 and 21) through a closure of the matching transistor (11) controlled by the field.<IMAGE>

Description

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Claims (1)

OBJECT OF THE INVENTION An integral summation suppressor for a tape recorder comprising a positive, negative, and coaxial power supply, a serial connected input terminal with two identical frequency dependent circuits, each having a field-controlled transistor used as a voltage-controlled resistor. and also the control block of the shutter transistor. that in order to amplify the voltage with a limited gain coefficient and an output terminal, the passband of the Sumu noise suppressor is connected between the input terminal and the field of frequency-dependent circuits. characterized by increasing the credibility of its characteristics under serial production conditions while simultaneously reducing production costs, resistors, a field-controlled transistor are involved. its current generator and two identical parts, each of which includes a partition resistor and a tracking voltage, comprising a complementary transistor pair, two field-driven transistors and four-generators of the current, wherein the discharge of the first transistor-controlled transistor is coupled to the second transistor-controlled closure of the same tracker with the transistor-type emitter npn complementary pair, with the negative terminal connected to the voltage monitor first current generator and the external divider capacitor output. connected by a second terminal to a closure of a corresponding field-effect transistor and via a field splitter resistor of a field transistor controlled transistor and coupled to a negative power supply of this transistor current generator, the discharges of the two transistor controlled voltage semiconductors are coupled to the transistor field washers and a field-driven transducer washer, and a positive power terminal via a second current generator, the closure of the first transistor controlled by the first voltage follower field is connected via a resistor and an outlet of the first field-controlled transistor, the closure of the first transistor driven by the second voltage follower is connected via resistors to the outlet and the second transistor field outlet, the second transistor driven out of each field a voltage follower connected in parallel to a third base current generator - a collector of a typup-np transistor the complementary pair is connected to the negative power terminal, the emitter of the typup-n-p transistor of this pair is coupled to the base of the second n-p-n transistor directly, with the power supply terminal being connected via a fourth current generator, a transistor-controlled closure connected to the same transistor drain. its outlet is connected to a common power supply, and the washer is connected to a transistor support 1 controlled by a field of the first voltage converter. 1 drawing