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學校地址:湖南省 長沙市 雨花區 車站南路紅花坡路口 |
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學校地址:湖南省 長沙市 雨花區 車站南路紅花坡路口 |
功放電路技術參數: 輸出功率:25V,8ohm負載. 靈敏度: 200mV 輸入 25W 輸出 頻率響應:30Hz to 20KHz -1dB THD @ 1KHz: 0.1W 0.014% 1W 0.006% 10W 0.006% 20W 0.007% 25W 0.01% 音頻功放電路:
THD: 0.1W 0.024% 1W 0.016% 10W 0.02% 20W 0.045% 25W 0.07%
R1,R4 = 47K 1/4W 電阻
R2 = 4K7 1/4W 電阻
R3 = 1K5 1/4W 電阻
R5 = 390R 1/4W 電阻
R6 = 470R 1/4W 電阻
R7 = 33K 1/4W 電阻
R8 = 150K 1/4W 電阻
R9 = 15K 1/4W 電阻
R10 = 27R 1/4W 電阻
R11 = 500R 1/2W
R12,R13,R16 = 10R 1/4W 電阻
R14,R15 = 220R 1/4W 電阻
R17 = 8R2 2W 電阻
R18 = R22 4W 電阻 (wirewound)
C1 = 470nF 63V 薄膜電容器
C2 = 330pF 63V 薄膜電容器
C3,C5 = 470uF 63V 電解電容器
C4,C6,C8,C11 = 100nF 63V 薄膜電容器s
C7 = 100uF 25V 電解電容器
C9 = 10pF 63V 薄膜電容器
C10 = 1uF 63V 薄膜電容器
Q1-Q5 = BC560C 45V100mA 低噪聲高增益PNP三極管
Q6 = BD140 80V 1.5A PNP三極管
Q7 = BD139 80V 1.5A NPN 三極管
Q8 = IRF532 100V 12A N溝道場效應管
Q9 = IRF9532 100V 10A P溝道場效應管
電源電路
Parts: R1 = 3K3 1/2W 電阻 注意事項 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.
C1 = 10nF 1000V 薄膜電容器
C2,C3 = 4700΅F 50V 電解電容器
C4,C5 = 100nF 63V 薄膜電容器
D1 200V 8A 整流橋,讀都也可以用四個整流二極管
D2 發光二極管
F1,F2 3.15A 保險絲
電源變壓器次級輸出25V+25V(中間抽頭).
PL1 插座
SW1 開關