GB1555538A - Electronic audio alarm - Google Patents

Electronic audio alarm

Info

Publication number
GB1555538A
GB1555538A GB3238876A GB3238876A GB1555538A GB 1555538 A GB1555538 A GB 1555538A GB 3238876 A GB3238876 A GB 3238876A GB 3238876 A GB3238876 A GB 3238876A GB 1555538 A GB1555538 A GB 1555538A
Authority
GB
United Kingdom
Prior art keywords
audio alarm
electronic audio
electronic
alarm
audio
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
GB3238876A
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.)
MADEWEL PRODUCTS Ltd
Original Assignee
MADEWEL PRODUCTS 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 MADEWEL PRODUCTS Ltd filed Critical MADEWEL PRODUCTS Ltd
Priority to GB3238876A priority Critical patent/GB1555538A/en
Publication of GB1555538A publication Critical patent/GB1555538A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0269—Driving circuits for generating signals continuous in time for generating multiple frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
GB3238876A 1977-07-05 1977-07-05 Electronic audio alarm Expired GB1555538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3238876A GB1555538A (en) 1977-07-05 1977-07-05 Electronic audio alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3238876A GB1555538A (en) 1977-07-05 1977-07-05 Electronic audio alarm

Publications (1)

Publication Number Publication Date
GB1555538A true GB1555538A (en) 1979-11-14

Family

ID=10337836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3238876A Expired GB1555538A (en) 1977-07-05 1977-07-05 Electronic audio alarm

Country Status (1)

Country Link
GB (1) GB1555538A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994025956A1 (en) * 1993-04-30 1994-11-10 Federal Signal Corporation Tone generating circuit
GB2368997A (en) * 2000-07-18 2002-05-15 Rafiki Prot Ltd Warning circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994025956A1 (en) * 1993-04-30 1994-11-10 Federal Signal Corporation Tone generating circuit
US5754095A (en) * 1993-04-30 1998-05-19 Federal Signal Corporation Tone generating circuit
GB2368997A (en) * 2000-07-18 2002-05-15 Rafiki Prot Ltd Warning circuit
GB2368997B (en) * 2000-07-18 2005-05-11 Rafiki Prot Ltd Audible warning devices

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee