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12月03日
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C1 = 10nF 1000V Polyester Capacitor
D2 5mm. Red LED
R5 = 390R 1/4W Resistors
R9 = 15K 1/4W Resistors
R14,R15 = 220R 1/4W Resistors
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Q7 = BD139 80V 1.5A NPN Transistor
Power supply circuit diagram:
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C2 = 330pF 63V Polystyrene Capacitor
Frequency response: 30Hz to 20KHz -1dB
R18 = R22 4W Resistor (wirewound)
R6 = 470R 1/4W Resistors
Total harmonic distortion @10KHz: 0.1W 0.024% 1W 0.016% 10W 0.02% 20W 0.045% 25W 0.07% Q1-Q5 = BC560C 45V100mA Low noise High gain PNP Transistors
C4,C6,C8,C11 = 100nF 63V Polyester Capacitors
Q6 & Q7 must have a small U-shaped heatsink.
C9 = 10pF 63V Polystyrene Capacitor
R12,R13,R16 = 10R 1/4W Resistors
R7 = 33K 1/4W Resistors
C2,C3 = 4700΅F 50V ElectrolyTIc Capacitors
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Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter in series with Q8 Drain) with no input signal.
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Notes:
R8 = 150K 1/4W Resistors
Q6 = BD140 80V 1.5A PNP Transistor
Q8 = IRF532 100V 12A N-Channel Hexfet Transistor
C10 = 1΅F 63V Polyester Capacitor
C7 = 100΅F 25V ElectrolyTIc Capacitor
SW1 SPST Mains switch D1 200V 8A Diode bridge
Sensitivity: 200mV input for 25W output
Output power: well in excess of 25Watt RMS @ 8 Ohm (1KHz sinewave)
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.
R17 = 8R2 2W Resistor
T1 220V Primary, 25 + 25V Secondary 120VA Mains transformer
Total harmonic distortion @ 1KHz: 0.1W 0.014% 1W 0.006% 10W 0.006% 20W 0.007% 25W 0.01%
R1 = 3K3 1/2W Resistor
Unconditionally stable on capacitive loads
R1,R4 = 47K 1/4W Resistors
R11 = 500R 1/2W Trimmer Cermet
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R2 = 4K7 1/4W Resistors
关键词：音频放大器
C4,C5 = 100nF 63V Polyester Capacitors
R3 = 1K5 1/4W Resistors
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Q8 & Q9 must be mounted on heatsink.
R10 = 27R 1/4W Resistors
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Parts:
C1 = 470nF 63V Polyester Capacitor
PL1 Male Mains plug
C3,C5 = 470΅F 63V ElectrolyTIc Capacitors
F1,F2 3.15A Fuses with sockets[导读] 25W场效应管音频放大器(25W Mosfet audio amplifier) R1,R4 = 47K
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.
Q9 = IRF9532 100V 10A P-Channel Hexfet Transistor25W场效应管音频放大器(25W Mosfet audio amplifier)
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