Power MOSFET BD522 and BD512 is now obsolete, so you can use other power MOSFET according to its characteristics. Q1 and Q2 are wired as a pair Darlington transistor that serves as a preamplifier. R3 Preset controls the quiescent current while R2 providing feedback. The output coupled to the speaker through capacitor C4. capacitor C5 Is a power filter andC2 is decoupling capacitor for DC input.
Mosfet Audio Amplifier Parts list :
R1 : 39K
R2 : 560K
R3 : 4.7K Variable
R4 : 10K
C1 : 33pF
C2 : 1uF
C3 : 4.7uF
C4 : 220uF
C5 : 2200uF
D1 : 1N4001
Q1, Q2 : BC107
Q3 : BD512
Q4 : BD522
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