US3854104A - Circuit for controlling sound generator for alarm clocks - Google Patents

Circuit for controlling sound generator for alarm clocks Download PDF

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Publication number
US3854104A
US3854104A US00423780A US42378073A US3854104A US 3854104 A US3854104 A US 3854104A US 00423780 A US00423780 A US 00423780A US 42378073 A US42378073 A US 42378073A US 3854104 A US3854104 A US 3854104A
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United States
Prior art keywords
resistor
switch
circuit according
load
transistor
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Expired - Lifetime
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US00423780A
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English (en)
Inventor
F Assmus
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Gebrueder Junghans GmbH
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Gebrueder Junghans GmbH
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/36—Signal repeating devices

Definitions

  • a transistorized circuit for supplying energy to the electric sound generator of an alarm clock.
  • the transistorized circuit is in the form of an astable multivibrator with a relatively long period so that the sound generator will sound intermittently when supplied with energy by the circuit.
  • the circuit includes a resistor-capacitor timing network to determine the period thereof and an auxiliary resistor is provided which can momentarily be connected in the resistorcapacitor circuit toreduce the charging time of the capacitor.
  • the present invention relates to a circuit and control means for the fast starting of an astable multivibrator of low sweep frequency for controlling a sound generator for alarm clocks which is arranged in the output circuit.
  • FIG. 1 illustrates a multivibrator circuit with the control device according to the invention.
  • FIG. 2 illustrates a first embodiment of a quick action switch arrangement according to the invention.
  • FIG. 3 represents a second embodiment of a quick action switch arrangement according to the invention.
  • FIG. 4 shows a multivibrator circuit with a third embodiment of a quick action switch arrangement of the invention.
  • FIG. 5 illustrates a multivibrator circuit with a fourth embodiment of a quick action switch arrangement in conformity with the present invention.
  • the circuit according to the present invention is characterized primarily in that the charge resistor of the RC member which determines the signal delay is bridged by a series arrangement comprising a quick action switch and resistor means.
  • the quick action switch preferably comprises a current conducting rail in contact with a battery pole or is coupled to the turn-off key.
  • the quick action switch may also in a particularly advantageous manner comprise alarm tension spring means which serve as alarm release switch means.
  • the quick action switch and the resistor may be combined to a kind of potentiometer which is preferably manually operable.
  • the arrangement according to the present invention makes it possible to reduce the dead period of an electronic alarm clock after the insertion of the battery to a minimum, and does so with relatively simple means.
  • the product is thus greatly perfected and improved.
  • the multivi brator circuit in all of the FIGURES of the drawing comprises for instance complementarily arranged transistors T1 and T2, electric time members R1, R2 and C which determine the duration of the signals and the intervals therebetween, and a buzzer S in the output circuit.
  • the character Kl designates the alarm release switch
  • the character K2 designates the manual switchoff switch.
  • a quick action switch M As indicated in FIG. 1, arranged in parallel to the resistor R1 which determines the intervals is a quick action switch M and a resistor R3.
  • the resistor R3 preferably has a value of approximately 1 kilo-ohm.
  • the quick action switch is formed advantageously by means of the customary current conductor rail 1.
  • the other contact section which is designated with reference numeral 2 is connected to the resistor 3 forming a part of the present invention.
  • the customary current conductor rails which are connected to the poles of the battery are, of course, also connected to the driving circuit for the oscillating system of the clock which, however, is not illustrated.
  • the current conductor rail 1 is expediently so designed that when the battery is inserted into the clocks, the battery will for a brief period have the edge of part 1a pressed against the contact section 2.
  • This design of contact rail may simultaneously also serve as safety means for the connection of the battery.
  • FIG. 3 shows a quick action switch M which can be simultaneously actuated by the switch of key 3 of the alarm clock. In the illustrated position, the switch of contacts K2 are closed.
  • FIG. 4 illustrates a particularly interesting solution to the problem underlying the present invention.
  • the alarm clock release switch K1 which is preferably designed as an alarm tension spring 6 may be combined with the quick action switch M.
  • spring 6 has two contact areas 6a and 6b and the counter-contacts 7 and 8.
  • the alarm tension spring engages the alarm release bushing 9 in the direction of the arrow, its contact area 6b briefly contacts the contact area 7 and thus likewise forms a quick action switch M.
  • the alarm release switch is closed by means of the contacts 6a and 8.
  • the alarm clock has already previously by the quick action switch 6b/7 been placed into readiness of operation so that also in this instance an alarm signal will immediately be generated.
  • This embodiment is particularly advantageous as to manufacture and operation.
  • FIG. illustrates a further possibility of briefly reducing the resistance of the valve resistor R1 and of forming a quick action switch. in this instance this is realized by means of a variable resistor 10. in the illustrated position of operation the resistor 10 has a high value. It can preferably manually be brought into a low ohm position. After each actuation of the switch, a spring 11 sees to it that the switch is returned to its high ohm position.
  • a transistor having a base terminal and load terminals in the form of an emitter terminal and a collector terminal, a load having one side connected to one of said load terminals and the other side adapted for connection to one side of a source of direct current voltage, a first switch adapted for clock actuation and a second switch in series therewith adapted for manual actuation, one side of the serially connected switches connected to the other load terminal and the other side thereof adapted for connection to the other side of said source, a first resistor having one end connected to said other side of the serially connected switches, a capacitor having one side connected to said other end of said first resistor, a second resistor connected between the other side of said capacitor and said one load terminal, means operatively connecting the juncture of said first resistor and capacitor with said base terminal so as to bias the transistor to conduction when the capacitor attains a predetermined charge, a third resistor, and third switch means for momentarily connecting
  • a circuit according to claim 2 in which said other battery rail momentarily engages said further rail in re sponse to insertion ofa battery between said battery rails.
  • a circuit according to claim 1 which includes an actuator for said second manual switch, said third switch means being operated by said actuator.
  • each of said first switch and said third switch means have one element in common, said element being operable for closing said third switch means prior to closing said first switch when said first switch is actuated into closed position by said clock.
  • said third switch means is in the form of a variable resistor connecting said third resistor in parallel with said first resis tor and having a slider, and means biasing said slider toward maximum resistance position.
  • the first transistor is a PNP transistor having thecollector connected to said one side of said serially connected switches and the emitter connected to said one side of said load, said source having the plus side connected to the other side of said serially connected switches and the minus side connected to the other side of said load, said further transistor being an NPN transistor having the collector connected to the base of the first transistor and the emitter connected to the minus side of said source.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
US00423780A 1972-12-13 1973-12-11 Circuit for controlling sound generator for alarm clocks Expired - Lifetime US3854104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2260886A DE2260886C3 (de) 1972-12-13 1972-12-13 Alarmsignaleinrichtung für Weckeruhren

Publications (1)

Publication Number Publication Date
US3854104A true US3854104A (en) 1974-12-10

Family

ID=5864260

Family Applications (1)

Application Number Title Priority Date Filing Date
US00423780A Expired - Lifetime US3854104A (en) 1972-12-13 1973-12-11 Circuit for controlling sound generator for alarm clocks

Country Status (4)

Country Link
US (1) US3854104A (instruction)
CH (2) CH578760B5 (instruction)
DE (1) DE2260886C3 (instruction)
FR (1) FR2210863B3 (instruction)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1551095A (en) * 1975-09-29 1979-08-22 Seikosha Kk Alarm timepiece

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311111A (en) * 1964-08-11 1967-03-28 Gen Electric Controllable electric body tissue stimulators
US3341840A (en) * 1964-04-22 1967-09-12 Herschell A Berkheiser Combination metronome and pitch tone generator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341840A (en) * 1964-04-22 1967-09-12 Herschell A Berkheiser Combination metronome and pitch tone generator
US3311111A (en) * 1964-08-11 1967-03-28 Gen Electric Controllable electric body tissue stimulators

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Popular Electronics, pages 81, 82 July 1968. *

Also Published As

Publication number Publication date
CH1626173A4 (instruction) 1976-02-13
DE2260886B2 (de) 1977-09-01
DE2260886C3 (de) 1978-04-13
FR2210863A1 (instruction) 1974-07-12
CH578760B5 (instruction) 1976-08-13
FR2210863B3 (instruction) 1976-10-15
DE2260886A1 (de) 1974-06-20

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