GB836894A - Improvements in or relating to amplifying circuit arrangements employing transistors - Google Patents

Improvements in or relating to amplifying circuit arrangements employing transistors

Info

Publication number
GB836894A
GB836894A GB29392/56A GB2939256A GB836894A GB 836894 A GB836894 A GB 836894A GB 29392/56 A GB29392/56 A GB 29392/56A GB 2939256 A GB2939256 A GB 2939256A GB 836894 A GB836894 A GB 836894A
Authority
GB
United Kingdom
Prior art keywords
amplifier
path
series
resistor
frequency
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB29392/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB836894A publication Critical patent/GB836894A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

836,894. Crossover circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Sept. 26, 1956 [Sept. 29, 1955], No. 29392/56. Class 40 (4). [Also in Groups XL (b) and XL (c)] A first amplifier is connected to second and third (transistor) amplifiers via a cross-over network so that the second amplifier amplifies signals above a prescribed frequency and the third amplifier amplifies signals below said frequency, the network comprising a condenser C1 in series with the path to the first amplifier and a resistor R1 in series with the path to the third amplifier, the resistor having a value lying between the output resistance of the first amplifier and the input resistance of the other amplifiers. The path to the second amplifier 2 accordingly comprises a series condenser C1 and a shunt resistor R1 so that only the higher frequencies are passed while the path to the third amplifier 3 comprises a series resistor R1 and a shunt capacitor C1 so that only the lower frequencies are passed. A greater slope (e.g. 12 db per octave) may be obtained by adding further resistors and capacitors, for example as shown in Fig. 5 in which R”R1”R2”r and R1C1=R2C2=rC3=1/2##0 where R and r are the output and input resistances respectively of the transistors and f0 is the cross-over frequency.
GB29392/56A 1955-09-29 1956-09-26 Improvements in or relating to amplifying circuit arrangements employing transistors Expired GB836894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL836894X 1955-09-29

Publications (1)

Publication Number Publication Date
GB836894A true GB836894A (en) 1960-06-09

Family

ID=19843184

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29392/56A Expired GB836894A (en) 1955-09-29 1956-09-26 Improvements in or relating to amplifying circuit arrangements employing transistors

Country Status (5)

Country Link
BE (1) BE551334A (en)
DE (1) DE1070682B (en)
FR (1) FR1157674A (en)
GB (1) GB836894A (en)
NL (2) NL200863A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159017A (en) * 1984-05-15 1985-11-20 Rg Dynamics Ultra high resolution loudspeaker system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7208762A (en) * 1972-06-26 1973-12-28
IT1190873B (en) * 1982-06-17 1988-02-24 Sgs Microelettronica Spa HIGH EFFICIENCY AUDIO AMPLIFIER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2159017A (en) * 1984-05-15 1985-11-20 Rg Dynamics Ultra high resolution loudspeaker system
US4597100A (en) * 1984-05-15 1986-06-24 Rg Dynamics, Inc. Ultra high resolution loudspeaker system

Also Published As

Publication number Publication date
NL100137C (en)
DE1070682B (en) 1959-12-10
BE551334A (en)
FR1157674A (en) 1958-06-02
NL200863A (en)

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