JPS57166711A - Power amplifier for musical instrument - Google Patents
Power amplifier for musical instrumentInfo
- Publication number
- JPS57166711A JPS57166711A JP56052525A JP5252581A JPS57166711A JP S57166711 A JPS57166711 A JP S57166711A JP 56052525 A JP56052525 A JP 56052525A JP 5252581 A JP5252581 A JP 5252581A JP S57166711 A JPS57166711 A JP S57166711A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- supplied
- output
- voltage
- amplification
- 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
Abstract
PURPOSE: To effectively output maximum electric power against load variation by detecting a difference between signal components which correspond to the amplification factors of an input and an output signal, and then supplying a power voltage which corresponds to load impedance variation to an amplifier.
CONSTITUTION: An amplifier A1 which uses a couple of positive and negative power sources +B and -B is normally powered up by a power source device PS through overcurrent detectors CD and CD', and outputs an output signal Vo, obtained by multiplying an input signal Vi by a factor A, to a load Rl. The signal Vo is multiplied by a factor 1/A through resistnce R1 and R2 to obtain a signal Vo', and these signal Vo' and signal Vi are supplied to an error detector A2; and its difference detection output is supplied to a gate device G1, whose output is supplied to a control signal generator CG. Thus, voltages +B1 and -B1 are supplied for amplification in a band where load impedance is low, and high voltage +B and -B2 are supplied, corresponding to the waveform clipping of the voltage Vo, through voltage controllers G2 and G2' for amplification in a band where the load impedance is increased.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56052525A JPS57166711A (en) | 1981-04-07 | 1981-04-07 | Power amplifier for musical instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56052525A JPS57166711A (en) | 1981-04-07 | 1981-04-07 | Power amplifier for musical instrument |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57166711A true JPS57166711A (en) | 1982-10-14 |
Family
ID=12917157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56052525A Pending JPS57166711A (en) | 1981-04-07 | 1981-04-07 | Power amplifier for musical instrument |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57166711A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61174212U (en) * | 1985-04-18 | 1986-10-30 | ||
US7310502B2 (en) * | 2000-06-13 | 2007-12-18 | Matsushita Electric Industrial Co., Ltd. | Radio communications apparatus and transmission power control method thereof |
-
1981
- 1981-04-07 JP JP56052525A patent/JPS57166711A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61174212U (en) * | 1985-04-18 | 1986-10-30 | ||
US7310502B2 (en) * | 2000-06-13 | 2007-12-18 | Matsushita Electric Industrial Co., Ltd. | Radio communications apparatus and transmission power control method thereof |
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