25 Watt Mosfet Amplifier.pdf

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25 Watt MosFet Audio
Amplifier
High Quality simple unit
No need for a preamplifier
Circuit diagram:
Parts:
R1,R4_________47K
R2____________4K7
R3____________1K5
R5__________390R
R6__________470R
R7___________33K
R8__________150K
R9___________15K
R10__________27R
R11_________500R
R12,R13,R16__10R
R14,R15_____220R
R17___________8R2
R18____________R22
C1___________470nF
C2___________330pF
C3,C5________470µF
C4,C6,C8,C11_100nF
C7___________100µF
C9____________10pF
C10____________1µF
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/2W
1/4W
1/4W
2W
4W
63V
63V
63V
63V
25V
63V
63V
Resistors
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Trimmer Cermet
Resistors
Resistors
Resistor
Resistor (wirewound)
Polyester Capacitor
Polystyrene Capacitor
Electrolytic Capacitors
Polyester Capacitors
Electrolytic Capacitor
Polystyrene Capacitor
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
Power supply circuit diagram:
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
Notes:
•
Can be directly connected to CD players, tuners and tape
recorders. Simply add a 10K Log potentiometer (dual gang for
stereo) and a switch to cope with the various sources you need.
Q6 & Q7 must have a small U-shaped heatsink.
Q8 & Q9 must be mounted on heatsink.
Adjust R11 to set quiescent current at 100mA (best measured
with an Avo-meter in series with Q8 Drain) with no input signal.
A correct grounding is very important to eliminate hum and
ground loops. Connect in the same point the ground sides of R1,
R4, R9, C3 to C8. Connect C11 at output ground. Then connect
separately the input and output grounds at power supply ground.
•
•
•
•
Technical data:
Output power:
well in excess of 25Watt RMS with 8 Ohm (1KHz sinewave)
Sensitivity:
200mV input for 25W output
Frequency response:
30Hz to 20KHz -1dB
Total harmonic distortion : 1KHz:
0.1W
0.014%
1W
0.006%
10W
0.006%
20W
0.007%
25W
0.01%
Total harmonic distortion : 10KHz:
0.1W
0.024%
1W
0.016%
10W
0.02%
20W
0.045%
25W
0.07%

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