GB783669A - Improvements in or relating to indicator circuit arrangements employing transistors - Google Patents

Improvements in or relating to indicator circuit arrangements employing transistors

Info

Publication number
GB783669A
GB783669A GB35402/55A GB3540255A GB783669A GB 783669 A GB783669 A GB 783669A GB 35402/55 A GB35402/55 A GB 35402/55A GB 3540255 A GB3540255 A GB 3540255A GB 783669 A GB783669 A GB 783669A
Authority
GB
United Kingdom
Prior art keywords
relating
circuit arrangements
indicator circuit
arrangements employing
employing transistors
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
GB35402/55A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB783669A publication Critical patent/GB783669A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Induction Heating (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

783,669. Automatic temperature control systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 9, 1955 [Dec. 13, 1954], No. 35402/55. Class 38 (4). [Also in Groups XXXVIII and XL (c)] A transistor 1 is connected in a feedback oscillator circuit with a limiting collector resistor 3 so that the amplitude increases with falling temperature (see Group XL (c)), the output from amplifier 6 rising to increase the heating from coil 10. The coil 10 contains the oscillator circuit and tends to maintain the temperature constant.
GB35402/55A 1954-12-13 1955-12-09 Improvements in or relating to indicator circuit arrangements employing transistors Expired GB783669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL783669X 1954-12-13

Publications (1)

Publication Number Publication Date
GB783669A true GB783669A (en) 1957-09-25

Family

ID=19832223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35402/55A Expired GB783669A (en) 1954-12-13 1955-12-09 Improvements in or relating to indicator circuit arrangements employing transistors

Country Status (1)

Country Link
GB (1) GB783669A (en)

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