FR2267554A1 - Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals - Google Patents

Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals

Info

Publication number
FR2267554A1
FR2267554A1 FR7412619A FR7412619A FR2267554A1 FR 2267554 A1 FR2267554 A1 FR 2267554A1 FR 7412619 A FR7412619 A FR 7412619A FR 7412619 A FR7412619 A FR 7412619A FR 2267554 A1 FR2267554 A1 FR 2267554A1
Authority
FR
France
Prior art keywords
light emitting
emitting diodes
driving circuit
electronic circuits
logic signals
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.)
Granted
Application number
FR7412619A
Other languages
French (fr)
Other versions
FR2267554B1 (en
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to FR7412619A priority Critical patent/FR2267554A1/en
Publication of FR2267554A1 publication Critical patent/FR2267554A1/en
Application granted granted Critical
Publication of FR2267554B1 publication Critical patent/FR2267554B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of El Displays (AREA)

Abstract

Red and green light emitting diodes (DL2, DL2) are mounted in parallel opposition between the collectors of two (NPN) transistors (T1, T3) with a third transistor (T2) connected to the base of one of them (T3). Its base is connected through a resistor (R6) and diode (D2) is series to a probe (3) which is common to the base circuit of the first transistor (T1) and comprises a resistor (R5) and diode (D1) in series. The circuit is assembled in a cylindrical probe with the probe conductor (3) protruding. Two conductors permit connections to power supplies. The light emitting dioes show red for ligic (1) or green for logic (0) signals.
FR7412619A 1974-04-10 1974-04-10 Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals Granted FR2267554A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7412619A FR2267554A1 (en) 1974-04-10 1974-04-10 Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7412619A FR2267554A1 (en) 1974-04-10 1974-04-10 Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals

Publications (2)

Publication Number Publication Date
FR2267554A1 true FR2267554A1 (en) 1975-11-07
FR2267554B1 FR2267554B1 (en) 1976-12-17

Family

ID=9137499

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7412619A Granted FR2267554A1 (en) 1974-04-10 1974-04-10 Test lamp for electronic circuits - has two light emitting diodes with driving circuit responding to logic signals

Country Status (1)

Country Link
FR (1) FR2267554A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063356A1 (en) * 1981-04-16 1982-10-27 Mitsubishi Denki Kabushiki Kaisha Time switch arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0063356A1 (en) * 1981-04-16 1982-10-27 Mitsubishi Denki Kabushiki Kaisha Time switch arrangement

Also Published As

Publication number Publication date
FR2267554B1 (en) 1976-12-17

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Legal Events

Date Code Title Description
ST Notification of lapse