JPS5525874A - Magnetic recording reproducer - Google Patents

Magnetic recording reproducer

Info

Publication number
JPS5525874A
JPS5525874A JP9902278A JP9902278A JPS5525874A JP S5525874 A JPS5525874 A JP S5525874A JP 9902278 A JP9902278 A JP 9902278A JP 9902278 A JP9902278 A JP 9902278A JP S5525874 A JPS5525874 A JP S5525874A
Authority
JP
Japan
Prior art keywords
erasing
current
generating circuit
circuit
transformer
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
JP9902278A
Other languages
Japanese (ja)
Inventor
Naoya Fujita
Toru Sanbe
Shigemitsu Higuchi
Masamichi Yamada
Takao Arai
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9902278A priority Critical patent/JPS5525874A/en
Publication of JPS5525874A publication Critical patent/JPS5525874A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain stable and definite erasing effect by generating an invariably- constant erasing current by disconnecting an erasing current generating circuit from a recording bias current generating circuit.
CONSTITUTION: Coil L1 has the same inductance as erasing head H3 and its across output is supplied to erasing current generating circuit 2. Although constituting an oscillator close enough to Colpitts one using transformer T2 identical to oscillation transformer T1 of recording bias current generating circuit 1, circuit will not oscillate by itself without capacitor C10 and supplying an input from coil L1 to transistor Q3 via capacitor C10 develops an erasing voltage at the secondary side of transformer T2, so that this voltage should be the highest by selecting the value of resonance capacitor C15. As a result, the erasing current is equal in frequency to the bias current to cause no beat and the erasing current depends upon the inductance of head H3 and the power voltage of circuit 2, so that even if the input to transistor Q3 changes, the current will be held constant.
COPYRIGHT: (C)1980,JPO&Japio
JP9902278A 1978-08-16 1978-08-16 Magnetic recording reproducer Pending JPS5525874A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9902278A JPS5525874A (en) 1978-08-16 1978-08-16 Magnetic recording reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9902278A JPS5525874A (en) 1978-08-16 1978-08-16 Magnetic recording reproducer

Publications (1)

Publication Number Publication Date
JPS5525874A true JPS5525874A (en) 1980-02-23

Family

ID=14235583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9902278A Pending JPS5525874A (en) 1978-08-16 1978-08-16 Magnetic recording reproducer

Country Status (1)

Country Link
JP (1) JPS5525874A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869319U (en) * 1981-11-04 1983-05-11 アイワ株式会社 Twin cassette tape recorder
JPS6020296U (en) * 1983-07-19 1985-02-12 エクシン−ラインズ・ブロス，ソシエダツド・アノニマ Detachable construction toy
JPS6188799U (en) * 1984-11-14 1986-06-10

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869319U (en) * 1981-11-04 1983-05-11 アイワ株式会社 Twin cassette tape recorder
JPS6020296U (en) * 1983-07-19 1985-02-12 エクシン−ラインズ・ブロス，ソシエダツド・アノニマ Detachable construction toy
JPH0233835Y2 (en) * 1983-07-19 1990-09-11
JPS6188799U (en) * 1984-11-14 1986-06-10

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