Schematic diagram
Parts List:
| R1 = 100K - 1/4W R2 = 12K - 1/4W R3 = 47K - 1/4W R4 = 8K2 - 1/4W R5 = 1K5 - 1/4W R6 = 2K7 - 1/4W R7,R9 = 100R - 1/4W R8 = 560R - 1/2W R10 = 1R - 1/2W | P1 = 47K Log. Potentiometer C1,C2 = 10µF/63V C3 = 47µF/25V C4 = 100µF/35V C5 = 150nF C6,C7 = 220µF/25V C8 = 1000µF/25V Q1 = BC560C Q2,Q3 = BD439 |
Circuit Notes:
- Total electric current drawing of the circuit, recommended measured by inserting the probes of an multimeter across the positive output with the power supply and also the positive rail input with the amplifier, should be 700mA. Adjust R8 to obtain this value if needed.
- Q2 and Q3 must be mounted on a finned heatsink of 120x50x25mm. minimum dimensions.
- If needed, R2 could be modified to get 13V across C8 positive lead and negative ground.
- Add R5 and C5 if the bass-boost facility is needed.
3W- 5W Audio Amplifier circuit source: redcircuits.com
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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