Title:
DRIVING CIRCUIT FOR ALARMING HORN
Document Type and Number:
Japanese Patent JPH06324683
Kind Code:
A
Abstract:
PURPOSE: To remove spark noises from a voltage impressing switch, a movable contact band and a fixed contact band in an alarming horn.
CONSTITUTION: A driving circuit in an electronic alarming horn 20 includes a base current limiting means for minimizing a current to be impressed to a voltage impressing switch for the horn 20, a 1st transistor(TR) provided with an emitter voltage fixing means and a 2nd TR for supplying a driving current to the 1st TR while holding a saturated state in response to the trigger current of the 1st TR and acts so as to maintain the repeated vertical movement of an armature 11 for delaying the operation of the 2nd TR for a prescribed period in each open of a movable contact band 6 and a fixed contact band 5.
Inventors:
KIN EISHIYAKU
Application Number:
JP5269292A
Publication Date:
November 25, 1994
Filing Date:
March 11, 1992
Export Citation:
Assignee:
MANTO KIKAI KK
International Classes:
G10K9/12; G10K9/15; H01H9/54; (IPC1-7): G10K9/15; G10K9/12
Domestic Patent References:
| JPS5640599U | 1981-04-15 | |||
| JPS6232639U | 1987-02-26 |
Attorney, Agent or Firm:
Hironori Takenori