Schematic Diagram:
Component Part list
| R1-4 =1Kohm R2= 33Kohm R3-8=100ohm R5= 0.22ohm 5W R6=10ohm 2W R7= 6,8ohm 2W R9=12Kohm R10=10Kohm R11= 680ohm C1=560 pF 100V ceramic or mylar C2-7 =1 uF 63V MKT | C3-12 =220 uF 63V C4-5-10 =100 pF C6-9 =47uF 63V C8 =100 nF 100V MKT C11 =1 nF 100V MKT C13 =100 uF 25V C14=10pF 100V ceramic or mylar L1 =3μH [15 turns of 1mm around R6] 100V ceramic or mylar F1-2 =2A Fuse fast IC1=STK4036......STK4044 |
STK40xx power amplifier IC:
STK 4036 > Supply: ±35V - ±53,5V; Power (8R load): 50W
STK 4038 > Supply: ±40V - ±58V; Power (8R load): 60W
STK 4040 > Supply: ±43V - ±63V; Power (8R load): 70W
STK 4042 > Supply: ±46V - ±67V; Power (8R load): 80W
STK 4044 > Supply: ±51V - ±74V ; Power (8R load): 100V
Source: http://skema-elektronik.blogspot.com/2009/06/power-audio-amplifier-based-on-stk400xx.html
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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