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25W MOSFET Power Amplifier

Sunday, February 7th, 2021 - Audio Circuit

25W MOSFET power amplifier is quite simple and uses 2 MOSFET transistor power. Power output 25 watts of output power amplifier circuit of the MOSFET obtained in loud speaker 8 Ohm load. The circuit of 25W MOSFET power amplifier can be operated using a DC voltage source symmetrical ± 33 volts with a current consumption of 2 amperes. To make the circuit 25W MOSFET power amplifier can be seen schematics and lists the following components.

The Schematic Circuit Of 25W MOSFET Power Amplifier

Components List Of 25W MOSFET Power Amplifier

R1,R4 = 47K
R2 = 4K7
R3 = 1K5
R5 = 390R
R6 = 470R
R7 = 33K
R8 = 150K
R9 = 15K
R10 = 27R
R11 = 500R Trimmer
R12,R13,R16 = 10R
R14,R15 = 220R
R17 = 8R2
R18 = R22/4W

C1 = 470nF
C2 = 330pF
C3,C5 = 470µF/63V
C4,C6,C8,C11 = 100nF
C7 = 100µF/25V
C9 = 10pF
C10 = 1µF/63V
Q1-Q5 = BC560C
Q6 = BD140
Q7 = BD139
Q8 = IRF532
Q9 = IRF9532

Potentiometer R11 serves to set the output voltage so that 0 volts when the circuit 25W MOSFET power amplifier above is not given input signal. Transistors Q8 and Q9 must be mounted on the cooler (heat sink) to get rid of the heat generated transistor.

The circuit of 25W MOSFET power amplifier in the image above can be given input signals 200 mV of the equalizer or tone control. Output power amplifier circuit is preferably mounted speaker protectors to connect the power amplifier with a loud speaker, because the output 25W MOSFET power amplifier will generate a voltage surge when first turned on.