US1747961A - Volume control - Google Patents

Volume control Download PDF

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Publication number
US1747961A
US1747961A US308412A US30841228A US1747961A US 1747961 A US1747961 A US 1747961A US 308412 A US308412 A US 308412A US 30841228 A US30841228 A US 30841228A US 1747961 A US1747961 A US 1747961A
Authority
US
United States
Prior art keywords
radio
phonograph
volume
potentiometer
volume control
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 - Lifetime
Application number
US308412A
Other languages
English (en)
Inventor
Dow O Whelan
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to NL27834D priority Critical patent/NL27834C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US308412A priority patent/US1747961A/en
Priority to FR682235D priority patent/FR682235A/fr
Priority to GB28936/29A priority patent/GB319695A/en
Priority to DEA59143D priority patent/DE594303C/de
Application granted granted Critical
Publication of US1747961A publication Critical patent/US1747961A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to a volume control for radio-phonograph combinations in which, for example, as is well known, the audio-frequency apparatus of the radio receiver may be used for amplifying phonograph signals created by a suitable phonograph pick-up device.
  • FIG. 1 is a schematic wiring diagram of a radio-phonograph combination provided with a volume control means embodying the invention
  • Fig. 2 is a sid view partly in section of the combination control means
  • Fig. 3 is an end view of the same, on the same scale as Fig. 2.
  • Fig. 1,5, 6 and 7 are radiofrequency amplifier tubes connected 'in cascade through suitable tuned transformers 8 with a detector tube 9, which in turn feeds an audio-frequency amplifier comprising an amplifier tube 10 and an out-put tube 11 connected in cascade by suitable cou ling means such as audio frequency trans ormers 12.
  • the out-put tube 11 is connected with a reproducing device or loud speaker 13 and in the present example an out-put device such as an out-put transformer 14 is employed between tube 11 and the reproducing device.
  • an out-put device such as an out-put transformer 14 is employed between tube 11 and the reproducing device.
  • the above described apparatus represents any radio-receiving apparatus adapted for phonograph combination, that is, having a suitable audio-frequency amplifier and reproducer.
  • the receiver is supplied with energy from a suitable power supply device indicated at 15 which, as is well known, may comprise a suitable source of plate voltage together with means for supplying filament lighting current to the tubes of the set.
  • a suitable power supply device indicated at 15 which, as is well known, may comprise a suitable source of plate voltage together with means for supplying filament lighting current to the tubes of the set.
  • the filament su ply leads from 15 are indicated at 16, 17 an 18 while the plate voltage supply leads are indicated at 19, 20 and 21.
  • the source of power supply does not concern the invention and no further description thereof is believed to be necessary.
  • the radio volume is controlled by varying the radio-frequency input to the apparatus by means of a potentiometer 22 connected in the antenna circuit 23 in such a manner that the initial receiving tube 5 may have applied to its grid anv portion or all of the voltage set up by the drop through the potentiometer in the antenna circuit. This result is produced by moving a contact or contact arm 24 along the resistance of the potentiometer.
  • the potentiometer 22 represents any suitable radio volume control means and is not necessarily confined to the antenna circuit or to the resistor type but may be of any suitable type. and may be located at any suitable point in the receiver as is well known.
  • the set is also provided with a suitable phonograph pick-up device .25 indicated in the present example as of the electromagnetic type, which delivers signal energy to a potentiometer or variable resistor 26 from which the signal energy is taken through an output circuit 27.
  • a suitable phonograph pick-up device .25 indicated in the present example as of the electromagnetic type, which delivers signal energy to a potentiometer or variable resistor 26 from which the signal energy is taken through an output circuit 27.
  • one side of circuit 27 connects with the potentiometer arm 28 while the other side connects with one end of the potentiometer resistance, thus providing a variable volume control for phonograph operation.
  • Out-put circuit 27 is whic connected with the initial audio-frequency transformer 12 through a switch 29 which may be moved to the closed position when usin the phonograph pick-up device, and
  • a second switch 31 Connected with the switch 29 by suitable operating means 30 is a second switch 31 which preferably operates to open some portion of the receiving circuit such as the detector filament or the plate supply lead of the .radio frequency amplifiers when switch 29 is thrown to a position to connect the phonograph pick-up with the initial audio-frequen cy transformer 12. This prevents radio reception from interfering with the reproduction of phonographsignals and any suitable means of this character may be used.
  • variable resistor or potentiometer type of controls this type is simple and easily provided and particularly well adapted to present type radio receivers and phonograph pick-up devices.
  • volume control the same arrangement may be used.
  • potentiometer 22 has preferably about 2000 ohms total resistance while potentiometer 26 has about 60 ohms total resistance.
  • These resistances are thus readily adapted to be provided in circular form of equal length or equal angular length whereby they may be operated by the same means throu h the same range. They may thus be mounte in tandem relation on the same shaft 32 with an insulating coupling 33 between them, and controlled by a single control knob 34.
  • a single .control knob is utilized for varying the volume or output of the apparatus, thus entirely eliminating the confusion heretofore experienced by the user of such apparatus when confronted by two volume controls, one of which is always inoperative.
  • F urthermore the range of operation for either phonograph or radio is the same, which is a desirable feature, and the potentiometers are connected as indicated so that their maximum and minimum points will coincide, that is the volume will increase in the same direction in either case.
  • insulating bodies adapted to receive circular or semi-circular resistance strips 37 and 38 respectively, 38 in the present example being that for the phonograph control and 37 being for radio control.
  • the insulating bodies are provided with suitable central bearing means 39 which are aligned for receiving a common shaft 40 on which are mounted spring contact arms 41 for engaging the resistance strips 37 and 38.
  • the bodies are held in alignment with each other by a suitable spacer 42 and two bolts 43 and between the potentiometers in the shaft 40 is inserted an insulating coupling 44 of suitable construction.
  • each resistor or potentiometer is provided with end terminals 45 and a center terminal 46 which is connected with the moving arm or contact through a contact strip 47.
  • One end ofshaft 40 is provided with a control knob 48 which is adapted to be located on the panel face of the apparatus while the potentiometer itself is concealed behind the latter.
  • a bent strip frame 49 held at its ends by bolts 43 serves as a simple mounting means in connection with the instrument or apparatus panel which is indicated at 50.
  • radio volume separate means for controlling the phonograph volume
  • radio and phonograph control means being variable through the same movement range between difiering maximum and minimum values, and a common control means for varying said means simultaneously through said range.
  • a volume control means for an appa- 'ratus embodyin a radio recei circuit 80 and a dphonograp pick-u circuit, said means include 'ng a single contro panel knob, a shaft connected therewith, and a pair of variable resistors mounted on the shaft for simultaneous operation through the same move- 3
  • a ra 'o-phono ph a aratus means connected in one cid uit of ill; appa ratus for controlling the radio volume, means connected in another circuit of the apparatus for controlling the phonograph volume said radio and phonograph control means ing, variable through the same movement ran a between their maximum and minimum v5- ues, and a common control means for va said means simultaneously through said range.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Adjustable Resistors (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)
US308412A 1928-09-26 1928-09-26 Volume control Expired - Lifetime US1747961A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL27834D NL27834C (enrdf_load_stackoverflow) 1928-09-26
US308412A US1747961A (en) 1928-09-26 1928-09-26 Volume control
FR682235D FR682235A (fr) 1928-09-26 1929-09-24 Système simplifié de réglage de volume de sons pour les appareils du genre radio-électrophone
GB28936/29A GB319695A (en) 1928-09-26 1929-09-24 Improvements in and relating to volume control apparatus for combined phonographs and radio receivers
DEA59143D DE594303C (de) 1928-09-26 1929-09-25 Vorrichtung zur Lautstaerkenregelung bei kombinierten Geraeten fuer Rundfunk und Schallplattenwiedergabe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US308412A US1747961A (en) 1928-09-26 1928-09-26 Volume control

Publications (1)

Publication Number Publication Date
US1747961A true US1747961A (en) 1930-02-18

Family

ID=23193889

Family Applications (1)

Application Number Title Priority Date Filing Date
US308412A Expired - Lifetime US1747961A (en) 1928-09-26 1928-09-26 Volume control

Country Status (5)

Country Link
US (1) US1747961A (enrdf_load_stackoverflow)
DE (1) DE594303C (enrdf_load_stackoverflow)
FR (1) FR682235A (enrdf_load_stackoverflow)
GB (1) GB319695A (enrdf_load_stackoverflow)
NL (1) NL27834C (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106757977A (zh) * 2017-02-06 2017-05-31 无锡小天鹅股份有限公司 用于洗衣机的控制组件及具有其的洗衣机

Also Published As

Publication number Publication date
GB319695A (en) 1930-11-06
NL27834C (enrdf_load_stackoverflow)
DE594303C (de) 1934-03-15
FR682235A (fr) 1930-05-24

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