SU510004A1 - Line amplifier - Google Patents

Line amplifier

Info

Publication number
SU510004A1
SU510004A1 SU1985368A SU1985368A SU510004A1 SU 510004 A1 SU510004 A1 SU 510004A1 SU 1985368 A SU1985368 A SU 1985368A SU 1985368 A SU1985368 A SU 1985368A SU 510004 A1 SU510004 A1 SU 510004A1
Authority
SU
USSR - Soviet Union
Prior art keywords
resistor
transistor
line amplifier
line
terminal
Prior art date
Application number
SU1985368A
Other languages
Russian (ru)
Inventor
Кунцек Дитер
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of SU510004A1 publication Critical patent/SU510004A1/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Description

(54) ЛИНЕЙНЫЙ УСИЛИТЕЛЬ(54) LINEAR AMPLIFIER

I , Изобретение относитс  к радоитехнике, может использоватьс  дл  пьезоэлектриче- ских и емкостных телефонных микрофонов. Известен линейный усилитель дл  пьезо электрических и емкостных микрофонов, содержащий два Франзистора одного типаг проводимости, коллекторы которых объединены и подключены к одной из клемм лини непосредственно, а через два последовател но соединенных резистора - к базе первого транзистора и клемме микрофона, друга  клемма которого соединена через парал« лельную RC с точкой соединени  указанных резисторов, с базой второго транзистора, подсоединённой через резистОр к эмиттеру первого транзистора, а через резистор обратной св зи ко в торой клемме линии, котора  через резистор соединена с эмиттером второго транзистора. Цель изобретени  - регулирование коэ( фициента передачи независимо от полного входного сопротивлени  предварительного каскада, В предлагаекгом усилителе параллельно I резистору обратной св зи включены последовательно соединенные резистор и два диода в пр мом направлении дл  тока в линии. На чертеже изображена принципиальна  : схема усилител . Коллекторы транзисторов 1 и 2 одного I типа проводимости подключены к (ЛИНИИ 3, Через последовательно соединен: ные резисторы 4 и 5 они подключены к j базе транзистора 1 и к одной клемме микj рофова 6, аруга  клемма которого соеди неш непосредственно с базой транзистора ;2 и через параллельную , состо j щую из резистора 7 и конденсатора 8, I с точкой соединегш  резисторов 4 и 5, I через резистор 9 - с эмиттером транзи{стора 1,;а через резистор обратной св - I зи 1О, параллельно кoтopo ry подключены 1 последовательно соединенные резистор 11 и диоды 12, 13 в пр мом направлении дл  тока линии с клеммой линии 14, Последн   через резистор 15 соедийена с эмиттером транзистора 2. Устройство работает следующим обра|3ом .I, the invention relates to radio technology, can be used for piezoelectric and capacitive telephone microphones. A linear amplifier for piezo electric and capacitive microphones is known, containing two Franzistors of one type of conductivity, the collectors of which are directly connected to one of the line terminals and connected to the base of the first transistor and the microphone terminal, the other terminal of which is connected via a parallel RC with a point of connection of the indicated resistors, with the base of the second transistor connected through a resistor to the emitter of the first transistor, and through a feedback resistor to One of the terminals is connected to the emitter of the second transistor through a resistor. The purpose of the invention is to control the ratio (the transfer factor is independent of the input impedance of the pre-cascade. In the proposed amplifier, parallel to the feedback resistor are connected in series a resistor and two diodes in the forward direction for the current in the line. The figure shows the principle: amplifier circuit. transistors 1 and 2 of the same type I of conductivity are connected to (LINE 3, Through series-connected: resistors 4 and 5 they are connected to j base of transistor 1 and to one terminal of microforto 6, Aruga terminal which connects directly to the base of the transistor; 2 and through a parallel j consisting of resistor 7 and capacitor 8, I with a point of connecting resistors 4 and 5, I through a resistor 9 - with a transit emitter {store 1,; and through a resistor feedback connection - IO 1O, in parallel to which ry are connected 1 series-connected resistor 11 and diodes 12, 13 in the forward direction for the current of the line with the terminal of line 14, last through the resistor 15 connected to the emitter of the transistor 2. The device operates as follows 3.

SU1985368A 1972-12-29 1973-12-28 Line amplifier SU510004A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD16798872A DD101078A1 (en) 1972-12-29 1972-12-29

Publications (1)

Publication Number Publication Date
SU510004A1 true SU510004A1 (en) 1976-04-05

Family

ID=5489603

Family Applications (1)

Application Number Title Priority Date Filing Date
SU1985368A SU510004A1 (en) 1972-12-29 1973-12-28 Line amplifier

Country Status (5)

Country Link
CS (1) CS171946B1 (en)
DD (1) DD101078A1 (en)
DE (1) DE2364369A1 (en)
SU (1) SU510004A1 (en)
YU (1) YU35411B (en)

Also Published As

Publication number Publication date
DD101078A1 (en) 1973-10-12
YU35411B (en) 1980-12-31
YU336173A (en) 1980-06-30
CS171946B1 (en) 1976-11-29
DE2364369A1 (en) 1974-07-04

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