GB1280398A - Integrated circuit audible alarm system - Google Patents

Integrated circuit audible alarm system

Info

Publication number
GB1280398A
GB1280398A GB1879470A GB1879470A GB1280398A GB 1280398 A GB1280398 A GB 1280398A GB 1879470 A GB1879470 A GB 1879470A GB 1879470 A GB1879470 A GB 1879470A GB 1280398 A GB1280398 A GB 1280398A
Authority
GB
United Kingdom
Prior art keywords
supply
alarm system
circuit
sound
crystal
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
GB1879470A
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.)
Duracell Inc USA
Original Assignee
PR Mallory and Co Inc
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 PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Publication of GB1280398A publication Critical patent/GB1280398A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Amplifiers (AREA)

Abstract

1280398 Audible alarm systems P R MALLORY & CO Inc 20 April 1970 [21 April 1969] 18794/70 Heading G4F An alarm system comprises a transistorized oscillator circuit 2 driving a piezoelectric crystal X1 to generate an audible sound. To make the sound distinguishable from a noise background the supply to input terminal 4<SP>1</SP> is derived from a transistorized switching circuit 1 having a power input B1, the circuit 1 functioning as an oscillator to supply a pulsed supply to terminal 4<SP>1</SP> so that the crystal generates an intermittent sound. To minimize production costs the circuits 1, 2 are similar apart from resistor R1, capacitor Cl and crystal X1. The switching frequency is determined by the resonant circuit components R1, Cl.
GB1879470A 1969-04-21 1970-04-20 Integrated circuit audible alarm system Expired GB1280398A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81777869A 1969-04-21 1969-04-21

Publications (1)

Publication Number Publication Date
GB1280398A true GB1280398A (en) 1972-07-05

Family

ID=25223860

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1879470A Expired GB1280398A (en) 1969-04-21 1970-04-20 Integrated circuit audible alarm system

Country Status (2)

Country Link
DE (1) DE2019154A1 (en)
GB (1) GB1280398A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2852196C2 (en) * 1978-12-02 1983-01-27 Richard Hirschmann Radiotechnisches Werk, 7300 Esslingen Acoustic warning signal generator with periodically changing frequency of the output signal

Also Published As

Publication number Publication date
DE2019154A1 (en) 1971-03-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees