JPS55122211A - Bias adjustment unit of magnetic recorder - Google Patents
Bias adjustment unit of magnetic recorderInfo
- Publication number
- JPS55122211A JPS55122211A JP3093179A JP3093179A JPS55122211A JP S55122211 A JPS55122211 A JP S55122211A JP 3093179 A JP3093179 A JP 3093179A JP 3093179 A JP3093179 A JP 3093179A JP S55122211 A JPS55122211 A JP S55122211A
- Authority
- JP
- Japan
- Prior art keywords
- bias current
- current supply
- bias
- tapes
- set terminal
- 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.)
- Granted
Links
Abstract
PURPOSE: To prevent noise from mixing into a bias current supply circuit to make it possible to change the bias current considerably, by changing the set of the bias current by combination of the power source voltage and the output voltage of a bias oscillator.
CONSTITUTION: The power source voltage of terminal 2 is supplied to bias oscillator 1 through transistor TR3 for voltage adjustment and is supplied to triode AC switch 14 of the bias output voltage adjustment circuit through switching TR17. Switch 4 to control the base voltage of TR3 and TR17 is switched among small bias current supply set terminal 5 for ordinary tapes, large bias current supply set terminal 6 for FeCo tapes, comparatively large bias current supply set terminal 7 for CrO2 tapes, and very large bias current supply set terminal 8 for alloy tapes, and a prescribed bias current is given to heads 10 and 12.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3093179A JPS55122211A (en) | 1979-03-15 | 1979-03-15 | Bias adjustment unit of magnetic recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3093179A JPS55122211A (en) | 1979-03-15 | 1979-03-15 | Bias adjustment unit of magnetic recorder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55122211A true JPS55122211A (en) | 1980-09-19 |
JPS611803B2 JPS611803B2 (en) | 1986-01-20 |
Family
ID=12317417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3093179A Granted JPS55122211A (en) | 1979-03-15 | 1979-03-15 | Bias adjustment unit of magnetic recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55122211A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6388805A (en) * | 1986-10-01 | 1988-04-19 | 株式会社村田製作所 | Variable resistor |
-
1979
- 1979-03-15 JP JP3093179A patent/JPS55122211A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS611803B2 (en) | 1986-01-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS55122211A (en) | Bias adjustment unit of magnetic recorder | |
JPS5293257A (en) | Oscillator | |
JPS535755A (en) | Power source c ircuit | |
JPS5597875A (en) | Transistor direct current power supply for welding | |
JPS5288008A (en) | Magnetic recording and reproduction apparatus | |
JPS5622117A (en) | Electric power supply system for cmos memory circuit | |
JPS5499922A (en) | Switching regulator | |
JPS5443550A (en) | Stabilized power source circuit | |
JPS644190A (en) | Chrominance signal processor for magnetic recording and reproducing device | |
JPS5525874A (en) | Magnetic recording reproducer | |
JPS5333347A (en) | Power supply circuit of switching control type | |
JPS56153510A (en) | Fader device for tape recorder | |
JPS53852A (en) | Constant current source | |
JPS5310409A (en) | Recording bias circuit | |
JPS5465008A (en) | Television receiver with magnetic video recorder- reproducer | |
JPS5564610A (en) | Recording bias regulator | |
JPS5698730A (en) | Automatic pause device | |
JPS567212A (en) | Recording and reproducing device | |
JPS55117918A (en) | Exciting power supply circuit of electromagnetic flow meter | |
JPS5288009A (en) | Magnetic recording and reproduction apparatus | |
JPS5577013A (en) | Recording circuit in magnetic recorder | |
JPS54153614A (en) | Tape recorder | |
JPS5318367A (en) | Bias circuit | |
JPS5346652A (en) | Protection circuit for switching regulator | |
JPS5346634A (en) | Gate control unit for rectifier circuit |