SU1376268A1 - Subscriber line electronic power supply device - Google Patents

Abstract

The invention relates to communication technology and provides for the stabilization of the microphone supply current regardless of the length of the subscriber line, as well as reducing the attenuation introduced by the device into the line. The device contains a transistor (T) 1, resistors (P) 2, 3, and 7, a capacitor (K) 4, and a source 8 of power. Introduced T 6, P 5 and power supply 9. T 1, P 2, 3, and K 4 are analogous to inductance. T6, P7, and source 9 are the current source since a fixed base current T6 is provided in the common base circuit. The collector circuits of the transistors have high resistance values, thus ensuring low attenuation introduced by the device into the line. 1 il.

Description

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The invention relates to technical communication, which can be used to power a subscriber line of automatic telephone stores.

The purpose of the invention1 is to ensure the stabilization of the microphone current, regardless of the length of the subscriber line II, the attenuation reduction, introduced by the device into the line.

Pa drawing presents an electrical circuit of an electronic ycTpoiicTBa Ш1тани51 subscriber. ipt

The ectronic subscriber line power supply device contains HGPBLIH transistor 1, nerve 2 and BTopoi i 3. resistors, capacitor 4, nest Orthid resistor 5, second transistor 6, third resistor 7, power supply source 8. and a borehole 9.

The electronic device} zo:; ita.ni subscriber line works cj (e, way.

The first TpaHsvicTOp 1, iiepr L-iii 2, and the second 3 resistors and the capacitor 4 are analogous to inductive; The second transistor 6, the third resistor 7 and dio.pnitelnyIs exact; 9 wires are the source of the current, since the provided f1n: sirovanny current of the base of the transistor 6 in the circuit with a common base.

When a clipping path is broken, i.e. at the position of the telephone hook-up of the telephone aniarate, the second transistor

6 open fixed base current. Therefore, the Hepnbii i transistor is also opened, since the positive notif. Imyal is supplied to its base by the resistor i i sepTbiii 5. Poten, the dials are zero volts per side 8 of the thread, and are transmitted to the subscriber through the transistors.

When looping the subscriber / line (picking up the subscribers of the telephone tube), the power supply current of the microphone flows through the line, and the current source provides a stable value of the microphone's current. 5 depends on the d: h line. Therefore, with); snake} of the length of the line, i.e. the change in the sonrota of the loop, the current through the microphone, the composer L, the editor N. Yatsola Tehred M. Khodan

tats5g unchanged. Consequently, when defining a certain power supply current to the M1S (which is necessary, since with a small-low power supply, the mapped power is given, and with excessive current, the intrinsic microphone noise increases) and with a decrease in the line length, the power consumption decreases. .

The collector circuits of the transistors have high resistance values, thus ensuring low attenuation introduced by the device into the line.

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the invention

An electronic subscriber line power supply device containing the first T1 anzistor, the collector of which is connected to the first output of the first resistor, N-1S, the nerve output d, 1.1 I connect the subscriber: and-1 line, the base to the second output of the first resistor 1 and to the first capacitor lead, the emitter to the improper lead of the second resistor, the second lead of which is connected by the second lead of the capacitor and the negative-1 lead of the nitride source, and the t-retiy resistor, e with the fact that, in order to provide and stabilize the current supply The microphone, regardless of the length of the subscriber line and reduction of the interference of the device brought into the subscriber line, introduces a second transistor, the collector of which is an output for connecting the second wire of the subscriber line, ernggter connected to the first terminal of the third resistor, the second the output of which is connected to the positive output l, the on-line power supply, and the base to the negative output power supply and the positive output of the power source, and the fourth resistor, the first of which is connected chen to the base of the first transistor and the second output - to the collector of the second transistor.

Proofreader V. Booth ha

Claims (1)

Claim Electronic power device 20 subscriber line containing the first transistor, the collector of which is connected to the first output of the first resistor., Which is the first output for connecting the subscriber line, 25 base - to the second terminal of the first resistor and to the first terminal of the capacitor, the emitter - to the first terminal of the second resistor, the second terminal of which is connected to the second terminal of the capacitor30 and the negative terminal of the power supply, and the third resistor, excluding In order to ensure stabilization of the microphone current, regardless of the length of the subscriber line and to reduce the attenuation introduced by the device into the subscriber line, a second transistor is introduced into it, the collector of which is an output for connecting the second wire of the bondent line, the emitter is connected to the first terminal of the third resistor, the second terminal of which is connected to the positive terminal of the auxiliary power supply and the negative terminal to the negative terminal of the additional power supply and the positive terminal of the microphone power supply, regardless of the length of the cable. Therefore, when changing the power supply, and the fourth resistor, the first output of which is connected to the base of the line length, the stucco molding