GB768088A - Improvements in or relating to sound reproducing or recording apparatus - Google Patents

Improvements in or relating to sound reproducing or recording apparatus

Info

Publication number
GB768088A
GB768088A GB548254A GB548254A GB768088A GB 768088 A GB768088 A GB 768088A GB 548254 A GB548254 A GB 548254A GB 548254 A GB548254 A GB 548254A GB 768088 A GB768088 A GB 768088A
Authority
GB
United Kingdom
Prior art keywords
station
aerial
plug
feb
condenser
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
GB548254A
Inventor
Konrad Short
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.)
TRUVOX Ltd
Original Assignee
TRUVOX 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 TRUVOX Ltd filed Critical TRUVOX Ltd
Priority to GB548254A priority Critical patent/GB768088A/en
Publication of GB768088A publication Critical patent/GB768088A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/20—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)
  • Structure Of Receivers (AREA)

Abstract

768,088. Radio receiving circuits and apparatus. TRUVOX, Ltd. Feb. 24, 1955 [Feb. 24, 1954], No. 5482/54. Class 40(5) A device for converting an audio amplifier for radio reception comprises a telephone-type jack plug 4 the body 1 of which is enlarged so as to contain a crystal receiver. The body 1 may be cast in metal, or of plastic material sprayed internally with a metal coating. The receiver comprises aerial terminal 12, a dust-core R.F. transformer 5, trimmer condensers 6, 7 and station-selecting switch 8, and a crystal detector 13. The trimmers 6, 7 may be adjusted through apertures 10. The aerial' is connected to a primary winding on the transformer 5 through a low-pass filter 16 and the detector 13 to a teriary winding, the secondary being tuned to one station by condenser 6 and condenser 7 added in parallel for tuning to a second station. A telescopic aerial may be mounted en the plug. In another embodiment, Fig. 4 (not shown), the receiver comprises a three-way three-gang switch, the extra position being used for switching over to a pretuned long-wave circuit. In this embodiment the body of the plug comprises a U-shaped member with a U-shaped cover.
GB548254A 1954-02-24 1954-02-24 Improvements in or relating to sound reproducing or recording apparatus Expired GB768088A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB548254A GB768088A (en) 1954-02-24 1954-02-24 Improvements in or relating to sound reproducing or recording apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB548254A GB768088A (en) 1954-02-24 1954-02-24 Improvements in or relating to sound reproducing or recording apparatus

Publications (1)

Publication Number Publication Date
GB768088A true GB768088A (en) 1957-02-13

Family

ID=9797030

Family Applications (1)

Application Number Title Priority Date Filing Date
GB548254A Expired GB768088A (en) 1954-02-24 1954-02-24 Improvements in or relating to sound reproducing or recording apparatus

Country Status (1)

Country Link
GB (1) GB768088A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2477634A (en) * 2010-02-04 2011-08-10 John Crawford Audio interface device
US9699578B2 (en) 2011-08-05 2017-07-04 Ingenious Audio Limited Audio interface device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2477634A (en) * 2010-02-04 2011-08-10 John Crawford Audio interface device
US9699578B2 (en) 2011-08-05 2017-07-04 Ingenious Audio Limited Audio interface device

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