JPS5797724A - Switching circuit - Google Patents

Switching circuit

Info

Publication number
JPS5797724A
JPS5797724A JP55174324A JP17432480A JPS5797724A JP S5797724 A JPS5797724 A JP S5797724A JP 55174324 A JP55174324 A JP 55174324A JP 17432480 A JP17432480 A JP 17432480A JP S5797724 A JPS5797724 A JP S5797724A
Authority
JP
Japan
Prior art keywords
terminal
afc
tuner
trs
control signal
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
JP55174324A
Other languages
Japanese (ja)
Inventor
Kazumi Kawashima
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55174324A priority Critical patent/JPS5797724A/en
Publication of JPS5797724A publication Critical patent/JPS5797724A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/62—Switching arrangements with several input- output-terminals, e.g. multiplexers, distributors

Landscapes

  • Electronic Switches (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To apply an S curve output for AFC of a tuner and a fixed voltage to an AFC voltage supply terminal through a common temperature compensating circuit, by switching two transistors, which have emitters connected in common, by a control signal to generate the S curve output for AFC of the tuner and the fixed voltage. CONSTITUTION:The S curve output for AFC applied from a terminal 16 is subjected to impedance conversion and temperature compensation through the emitter follower circuit of transistors TRs 19 and 21 to obtain an output for receiving signal detection for automatic sweep control from a terminal 23. When the control signal from a terminal 17 to the terminal for AFC operation switching of the tuner is H, TRs 26, 27, and 31 are turned on, and the S curve output for AFC is subjected to temperature compensation by a TR 33 and a resistance 34 and is applied from a terminal 18 to the AFC voltage applying terminal. When the control signal from the terminal 17 is L, TRs 30 and 31 are turned on, and a fixed voltage divided by resistances 35 and 36 is taken out by the emitter follower circuit of a TR 28 and is outputted from the terminal 18 through a temperature compensating circuit.
JP55174324A 1980-12-10 1980-12-10 Switching circuit Pending JPS5797724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55174324A JPS5797724A (en) 1980-12-10 1980-12-10 Switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55174324A JPS5797724A (en) 1980-12-10 1980-12-10 Switching circuit

Publications (1)

Publication Number Publication Date
JPS5797724A true JPS5797724A (en) 1982-06-17

Family

ID=15976644

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55174324A Pending JPS5797724A (en) 1980-12-10 1980-12-10 Switching circuit

Country Status (1)

Country Link
JP (1) JPS5797724A (en)

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