SU1394237A1 - Device for reproducing a stereo signal of tape recorder - Google Patents

Abstract

The invention relates to a magneto recording technique. The purpose of the invention is to improve the electroacoustic parameters of reproduction. The introduction of new elements and the formation of new connections make it possible to avoid listening to clicks on switching on and off the tape recorder. When bus 18 is turned on at the base of transistor 13, a positive potential appears equal to the potential at the emitter, tf transistor 13 is closed, disconnecting the transistor 9 from the common bus 14 of the power supply source through a transistor 9. A capacitor 16 is charged through the transistor 9, charge transistor 9 is closed, and at the bases of transistors 1 and 2 is set at zero-g howling potential amplifiers 5 and 6 deblokiruyuts 1 yl about 4

Description

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The invention relates to instrumentation, in particular, to a technique of magnetic recording, and can be used in radio engineering devices for blocking signal circuits when the power source is turned on / off.

The purpose of the invention is to improve the electroacoustic reproduction parameters by reading the sounding language. click type noise at times when the tape recorder turns on and off,

The drawing shows a schematic diagram of the device

The device contains the first I and second 2 transistors, the collectors of which are connected respectively to the outputs 3 and 4 of the left 5 and right 6 playback amplifiers, the emitters are connected to the relay, and the bases are connected through the second 7 and third 8 resistors to the collector of the fourth transistor 9 p-p- p type emitter; ) which is connected through a quarter-resistor 10 to the first power bus 11 and through the fifth resistor 12 to the emitter of the third transistor 13, the collector of which is connected to the common busbar 14, and the base is connected to the housing through the first resistor 15 13 is connected to the housing bus 14 via a capacitor 16 and a sixth resistor 17, the connection point of which is connected to the base of the fourth transistor 9o. The base of the transistor 13 is connected to the second, power supply bus 18

The device works as follows

Through the supply bus II, a positive potential opens up the transistor 13, and therefore the transistors 1 and 2, which shunt the outputs of the amplifiers 5 and 6. After applying voltage to the bus 11, the tape recorder is turned on and the bus 18 is turned on. the base of the transistor 13 appears a positive potential equal to the potential at the emitter, Tooe transistor 13 closes, disconnecting the base of transistor 9 from the common bus 14

power supply Through an open transistor 9 through the circuit resistor 10, the transition emitter - the base of the transistor 9, the capacitor 16 is charged this capacitor. As the charge

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The transistor 9 is closed and zero potential is established at the bases of transistors 1 and 2. Transistors 1 and 2 are closed - outputs 3 and 4 of amplifiers 5 and 6 are enabled. The charge time of the capacitor 16 determines the duration of the transients when the power bus 18 is turned on, and the first exceeds the second, which is determined by the choice of resistor 10 and capacitor 16

When the voltage is removed from the bus 18, the transistor 13 is in the open state, the capacitor 16 is discharged through the resistor 17 and the transistor 13o. When the base potential decreases, the transistor 9 opens. The positive potential arriving at the bases of transistors 1 and 2 opens to block them. The outputs of amplifiers 5 and 6 of playback. The bus 11 is turned off after the power is turned off on the bus 18 when the tape recorder is turned off.

The use of the circuit eliminates its duplication over the second power bus when using a known device.

Claims (1)

Invention Formula % A device for reproducing a stereo tape recorder signal, comprising first and second reproduction amplifiers connected to the first and second output lines connected to the collectors of the first and second transistors, respectively, whose emitters and one capacitor lead are connected to a common power supply bus connected to the collector The third transistor and the first output of the first resistor, the base of the first and second transistors are connected respectively via the second and third resistors to the collector The fourth transistor, the base of which is connected to another capacitor, and the emitter is connected to one of the fourth and fifth resistors, characterized in that, in order to improve the electro-acoustic reproduction parameters by eliminating listening to clicks when clicking and turning off the tape recorder, introduced 3139D237 The first power bus is connected, the emitter of which is connected to to the other terminal of the fourth resistor-point of connection of the other terminal p and connected to the amplifiers of the reproducing resistor and one terminal of the pointing pole, the second power bus from the resistor, the other terminal of which one with the other output of the first is connected to the base of the fourth transistor and the base of the third transistor