Wzmacniacz mosfet 25 W Hi-Fi.pdf

25 Watt MosFet AudioAmplifier

High Quality simple unit

No needfor a preamplifier

T echnicaldata:

Output power: well in excess of 25Watt RMS @ 8 Ohm (1KHz sinewave)

Sensitivity: 200mV input for 25W output

Frequencyresponse: 30Hz to 20KHz -1dB

T otal harmonicdistortion @ 1KHz: 0.1W 0.014% 1W 0.006% 10W 0.006% 20W 0.007% 25W 0.01%

T otal harmonicdistortion @10KHz: 0.1W 0.024% 1W 0.016% 10W 0.02% 20W 0.045% 25W 0.07%

Unconditionally stableon capacitive

loads

Circuit diagram:

Parts:

R1,R4_________47K 1/4W Resistors

R2____________4K7 1/4W Resistor

R3____________1K5 1/4W Resistor

R5__________390R 1/4W Resistor

R6__________470R 1/4W Resistor

R7___________33K 1/4W Resistor

R8__________150K 1/4W Resistor

R9___________15K 1/4W Resistor

R10__________27R 1/4W Resistor

R11_________500R 1/2W Trimmer Cermet

R12,R13,R16__10R 1/4W Resistors

R14,R15_____220R 1/4W Resistors

R17___________8R2 2W Resistor

R18____________R22 4W Resistor (wirewound)

C1___________470nF 63V Polyester Capacitor

C2___________330pF 63V Polystyrene Capacitor

C3,C5________470µF 63V Electrolytic Capacitors

C4,C6,C8,C11_100nF 63V Polyester Capacitors

C7___________100µF 25V Electrolytic Capacitor

C9____________10pF 63V Polystyrene Capacitor

C10____________1µF 63V Polyester Capacitor

Q1-Q5______BC560C 45V 100mA Low noise High gain PNP Transistors

Q6_________BD140 80V 1.5A PNP Transistor

Q7_________BD139 80V 1.5A NPN Transistor

Q8_________IRF532 100V 12A N-Channel Hexfet Transistor

Q9_________IRF9532 100V 10A P-Channel Hexfet Transistor

Parts:

R1____________3K3 1/2W Resistor

C1___________10nF 1000V Polyester Capacitor

C2,C3______4700µF 50V Electrolytic Capacitors

C4,C5_______100nF 63V Polyester Capacitors

D1__________200V 8A Diode bridge

D2__________5mm. Red LED

F1,F2_______3.15A Fuses with sockets

T1__________220V Primary, 25 + 25V Secondary 120VA Mains transformer

PL1_________Male Mains plug

SW1_________SPST Mains switch

Q Q8

Q Q9

R18

R17

C11

W WY

R15

Q Q6

R R7

Q Q7

C C9

R12

Q Q5

R13

R R9

R16

R R8

R11

R10

C C8

C C7

R R6

Q Q4

Q Q2

C C6

C C4

R R3

R R5

Q Q3

Q Q1

C C2

C C3

R R4

R R2

R R1

C C5

C C1

W WE