Amplifier part list:
P1 __________ 22K Log.Potentiometer (Dual-gang for stereo)
R1 __________ 560R
R2,R3 _______ 10K
R4 __________ 12K
R5,R6 _______ 2R2
R7 __________ 22R
C1 __________ 1uF/63V
C2,C3,C4 ____ 100uF/25V
C5 __________ 22pF/63V
C6 __________ 22uF/25V
IC1 _________ LM833 or NE5532
Q1,Q3 _______ BC337 45V 800mA NPN Transistors
Q2,Q4 _______ BC327 45V 800mA PNP Transistors
J1 __________ RCA audio input socket
Power supply part list:
R7 __________ 2K2
C7,C8 _______ 2200uF/25V
D1 __________ 100V 1A Diode bridge
D2 __________ 5mm. or 3mm. Red LED
IC2 _________ 7815 15V 1A Positive voltage regulator IC
IC3 _________ 7915 15V 1A Negative voltage regulator IC
T1 __________ 220V Primary, 15 + 15V Secondary 5VA Mains transformer
PL1 _________ Male Mains plug
SW1 _________ SPST Mains switch
Technical data:
- Output voltage: Well above 5V RMS on all loads
- Sensitivity: 250mV input for 5V RMS output
- Frequency response: Flat from 30Hz to 20KHz
- Total harmonic distortion @ 1KHz & 10KHz: Below 0.005% on 32 Ohms load and up to 4V RMS output (typical 0.003%)
- Total harmonic distortion @ 1KHz & 10KHz: Below 0.005% on 100 to 2000 Ohms load and up to 5V RMS output (typical 0.003%)
About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.
The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.
While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at wikipedia.org
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.
The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.
While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at wikipedia.org
This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.
Watch the video:
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