JPS57152791A - Dial pulse receiving circuit - Google Patents

Dial pulse receiving circuit

Info

Publication number
JPS57152791A
JPS57152791A JP3848081A JP3848081A JPS57152791A JP S57152791 A JPS57152791 A JP S57152791A JP 3848081 A JP3848081 A JP 3848081A JP 3848081 A JP3848081 A JP 3848081A JP S57152791 A JPS57152791 A JP S57152791A
Authority
JP
Japan
Prior art keywords
contact
relay
dial pulse
dial
receiving circuit
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.)
Pending
Application number
JP3848081A
Other languages
Japanese (ja)
Inventor
Seiji Inohara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3848081A priority Critical patent/JPS57152791A/en
Publication of JPS57152791A publication Critical patent/JPS57152791A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses

Abstract

PURPOSE:To improve the reliability of contacts and enable to use a lead relay for a dial pulse receiving circuit by connecting a protection circuit consisting of a photocoupler and a dial pulse auxiliary relay to the contact of the lead relay. CONSTITUTION:The primary current of a photocoupler PC1 is intermitted by the contact (a) of a relay A intermitted by the dial operation of a telephone TEL. At that time, the maximum voltage applied to the contact (a) is suppressed low by a voltage regulator diode RC1. Current flowing into the contact (a) also can be suppressed low by R2, so that the contact (a) of the lead relay A is in an ideal load condition. The primary current of the PC1 is amplified by the PC1 and makes a relay AA intermittent according to dial pulses, which is transmitted to the external through an contact aa.
JP3848081A 1981-03-17 1981-03-17 Dial pulse receiving circuit Pending JPS57152791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3848081A JPS57152791A (en) 1981-03-17 1981-03-17 Dial pulse receiving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3848081A JPS57152791A (en) 1981-03-17 1981-03-17 Dial pulse receiving circuit

Publications (1)

Publication Number Publication Date
JPS57152791A true JPS57152791A (en) 1982-09-21

Family

ID=12526413

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3848081A Pending JPS57152791A (en) 1981-03-17 1981-03-17 Dial pulse receiving circuit

Country Status (1)

Country Link
JP (1) JPS57152791A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7405520B2 (en) 2004-03-22 2008-07-29 Matsushita Electric Industrial Co., Ltd. Curved lamp manufacturing method, curved lamp, and backlight unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7405520B2 (en) 2004-03-22 2008-07-29 Matsushita Electric Industrial Co., Ltd. Curved lamp manufacturing method, curved lamp, and backlight unit

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