GB798997A - Improvements in and relating to oscillation generators employing transistors - Google Patents

Improvements in and relating to oscillation generators employing transistors

Info

Publication number
GB798997A
GB798997A GB2422254A GB2422254A GB798997A GB 798997 A GB798997 A GB 798997A GB 2422254 A GB2422254 A GB 2422254A GB 2422254 A GB2422254 A GB 2422254A GB 798997 A GB798997 A GB 798997A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
relating
oscillation generators
rectified
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
GB2422254A
Inventor
Francis Rock Carling
Denis Lionel Johnston
William John Markwick
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.)
FORTIPHONE Ltd
Original Assignee
FORTIPHONE 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 FORTIPHONE Ltd filed Critical FORTIPHONE Ltd
Priority to GB2422254A priority Critical patent/GB798997A/en
Publication of GB798997A publication Critical patent/GB798997A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F5/00—Amplifiers with both discharge tubes and semiconductor devices as amplifying elements

Abstract

798,997. Rectifying. FORTIPHONE, Ltd. May 23, 1955 [Aug. 19, 1954], No. 24222/54. Class 38 (2). [Also in Groups XXXIX and XL (c)] In a hearing aid circuit a transistor 32 acts both as an oscillator and an amplifier. The oscillations set up by the transistor are rectified to produce H.T. for other components in the circuit. Windings 39, 41 of a transformer 40 are arranged to couple the base electrode band the collector c of the transistor 32, thus causing it to oscillate. The stepped-up oscillations which appear in the winding 42 of the transformer 40 is then rectified in a known voltage doubling circuit comprising capacitors and rectifiers 43 ... 46 and applied to other components, such as valves 29, 30, in the hearing aid circuit.
GB2422254A 1954-08-19 1954-08-19 Improvements in and relating to oscillation generators employing transistors Expired GB798997A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2422254A GB798997A (en) 1954-08-19 1954-08-19 Improvements in and relating to oscillation generators employing transistors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2422254A GB798997A (en) 1954-08-19 1954-08-19 Improvements in and relating to oscillation generators employing transistors

Publications (1)

Publication Number Publication Date
GB798997A true GB798997A (en) 1958-07-30

Family

ID=10208307

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2422254A Expired GB798997A (en) 1954-08-19 1954-08-19 Improvements in and relating to oscillation generators employing transistors

Country Status (1)

Country Link
GB (1) GB798997A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125646A (en) * 1964-03-17 Electromagnetically coupled hearing aid
US3207987A (en) * 1961-01-31 1965-09-21 Kiryluk Wlodzimierz Radio rescue apparatus
US3229049A (en) * 1960-08-04 1966-01-11 Goldberg Hyman Hearing aid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125646A (en) * 1964-03-17 Electromagnetically coupled hearing aid
US3229049A (en) * 1960-08-04 1966-01-11 Goldberg Hyman Hearing aid
US3207987A (en) * 1961-01-31 1965-09-21 Kiryluk Wlodzimierz Radio rescue apparatus

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