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
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