The scheme?presented here?is a?MOSFET?10W?audio?amplifier circuit?which?requires only single power supply. Single?rail?supply is rarely used in?Class-B?power amplifiers. Anyway, it’s?good?enough for?low?power applications. In fact,?this circuit is taken?from?old?cassette player?that still works.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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