JPS5680928A - Level change-over circuit - Google Patents

Level change-over circuit

Info

Publication number
JPS5680928A
JPS5680928A JP15767079A JP15767079A JPS5680928A JP S5680928 A JPS5680928 A JP S5680928A JP 15767079 A JP15767079 A JP 15767079A JP 15767079 A JP15767079 A JP 15767079A JP S5680928 A JPS5680928 A JP S5680928A
Authority
JP
Japan
Prior art keywords
voltage
collector
turns
saturation state
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
JP15767079A
Other languages
Japanese (ja)
Inventor
Hideaki Uchikura
Masahiro Shimauji
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 JP15767079A priority Critical patent/JPS5680928A/en
Publication of JPS5680928A publication Critical patent/JPS5680928A/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

Landscapes

  • Digital Magnetic Recording (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To reduce variation in output level and power consumption by cutting one of two transistors off while conducting the other in a saturation state in response to a supplied change-over signal. CONSTITUTION:With switch 12 open, transistor TR16 turns off, and TR17 turns on. Then, the collector current flows to resistance 18 and magnetic head driving circuit 19. The low-level collector voltage of TR17 is clamped to a value lower than the earth potential by the collector-emitter voltage of TR17 in a saturation state. In the saturation state, the TR collector-emitter voltage is extremely small, and therefore fluctuations of the voltage are small, stabilizing the read operation of circuit 19. With switch 12 closed, TR16 turns on, and TR17 turns off. The collector current of TR16 flows to resistor 18, circuit 19 and magnetic heads 20-23. At this time, the high-level collector voltage of TR16 has a value lower than DC voltage V7 by the emitter-collector voltage of TR in the saturation state. Therefore, circuit 19 can perform stable write operation.
JP15767079A 1979-12-05 1979-12-05 Level change-over circuit Pending JPS5680928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15767079A JPS5680928A (en) 1979-12-05 1979-12-05 Level change-over circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15767079A JPS5680928A (en) 1979-12-05 1979-12-05 Level change-over circuit

Publications (1)

Publication Number Publication Date
JPS5680928A true JPS5680928A (en) 1981-07-02

Family

ID=15654806

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15767079A Pending JPS5680928A (en) 1979-12-05 1979-12-05 Level change-over circuit

Country Status (1)

Country Link
JP (1) JPS5680928A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6074818A (en) * 1983-09-30 1985-04-27 Yokogawa Hokushin Electric Corp Pulse counter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5090095A (en) * 1973-12-17 1975-07-18
JPS5036454B1 (en) * 1971-05-14 1975-11-25
JPS531104A (en) * 1976-06-24 1978-01-07 Nippon Steel Corp Dephosphrization of metal or alloy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5036454B1 (en) * 1971-05-14 1975-11-25
JPS5090095A (en) * 1973-12-17 1975-07-18
JPS531104A (en) * 1976-06-24 1978-01-07 Nippon Steel Corp Dephosphrization of metal or alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6074818A (en) * 1983-09-30 1985-04-27 Yokogawa Hokushin Electric Corp Pulse counter

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