This is 45W power audio amplifier circuit which built using HEXFET IRF9540 and IRF540. This is a ideal solution for the make a good, low cost power amplifier circuit.
Components List:
| R1 = 47K ohm | C1-2-6-7 = 100nF 100V MKT | Q5-6 = IRF9540 |
| R2-12 = 1K ohm | C3-4 = 22uF 25V | Q7-8 = IRF540 |
| R3-4 = 3.3K ohm | C5 = 220pF styroflex | TR1 = 5K ohm trimmer multiturn |
| R5 = 1.2K ohm | C8-9 = 4700uF 63V | TR2 = 1K ohm trimmer multiturn |
| R6 = [1.2K ohm] 820 ohm *See text | C10 = 1uF 100V MKT | F1-2 = fuse 3A |
| R7 = 270 ohm | D1-2 = 15V 0.5W zener | J1 = 2pin connector 2.54mm step |
| R8 = 220 ohm | IC1 = LF411orAD711or LF351 | J2 = 5pin connector 5mm step |
| R9 = 27K ohm | Q1 = BC550C | |
| R10-11 = 22K ohm | Q2 = BC560C | All Resistors 1/4W 1% metal film |
| R13-14-15-16 = 150 ohm | Q3-4 = BC547B |
The preamplifier and the driver support in a operational amplifier [IC1]. The voltage fall in resistors R5 and TR2/R6, drive the output FET's gates and is proportional with the input signal level. Transistors Q1-2 function as voltage stabilizers in the supply lines, but ensure also the essential voltage fall, because the IC1 it should not they are supplied with voltage bigger ± 18V. The consumption of all types that can be used in the place of IC1, are 2 mA, this it means voltage fall in terminal the R5 and TR2/R6 equal with the 2.4 until 2.6Volts. The current regulation it become from transistors Q3-4 in Wilson connection and the current adjustment of bias it becomes from the multiturn TR1 trimmer.
Detailed information about this 45W power audio amplifier circuit with HEXFET:
http://users.otenet.gr/~athsam/power_amplifier_45w_hexfet_eng.htm
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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