JPS5525874A - Magnetic recording reproducer - Google Patents
Magnetic recording reproducerInfo
- 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
Links
Landscapes
- Digital Magnetic Recording (AREA)
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
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)
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 |
-
1978
- 1978-08-16 JP JP9902278A patent/JPS5525874A/en active Pending
Cited By (4)
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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