Thursday, June 16, 2011

60W MOSFET Power Amplifier Circuit

The following diagram is the schematic diagram of 60W Power Amplifier powered by MOSFET. The MOSFET amplifier should be better than ordinary transistored amplifier circuit.

Power Amplifier Schematic:

60W MOSFET Power  Amplifier circuit diagram

Component Parts List:
R1 = 47K
R2 = 4K7
R3 = 22K
R4 = 1K
R5, R12, R13 = 330R
R6 = 1K5
R7 = 15K
R8 = 33K
R9 = 150K
R10 = 500R 1/2W Trimmer Cermet
R11 = 39R
R14,R15 = R33 2.5W Resistors
R16 = 10R 2.5W Resistor
R17 = R22 5W Resistor (wirewound)
C1 = 470nF
C2 = 470pF
C3 = 47µF/63V
C4,C8,C9,C11 = 100nF
C5 = 10pF
C6 = 1µF 63V Polyester Capacitor
C7,C10 = 100µF/63V
D1 = 1N4002
D2 = 5mm. Red LED
Q1, Q2, Q4 = MPSA43
Q3, Q5 = BC546
Q6 = MJE340
Q7 = MJE350
Q8 = IRFP240
Q9 = IRFP9240

Power Supply Schematic:
Use below power supply circuit to handle above 60W MOSFET amplifier circuit.
60W MOSFET Power  Amplifier PCB Layout

Component Parts List:
R1 = 3K9 / 1W Resistor
C1, C2 = 4700µF/63V Electrolytic Capacitors (See Notes)
C3, C4 = 100nF
D1 = 400V 8A Diode bridge
D2 = 5mm. Red LED
F1,F2 = 4A Fuses with sockets
T1 = 230V or 115V Primary, 30+30V Secondary 160VA Mains transformer

Source: redcircuit, visit the page for complete explanation
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
This is the video tutorial about how to build a realy simple headphone amplifier. The circuit powered with 9V battery and use an IC to amplify the input signal from mp3 player.
Watch the video:

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