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學(xué)校地址:湖南省 長沙市 雨花區(qū) 車站南路紅花坡路口 |
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學(xué)校地址:湖南省 長沙市 雨花區(qū) 車站南路紅花坡路口 |
功放技術(shù)指標 輸出功率: 18 Watt RMS @ 8 Ohm (1KHz sinewave) 靈敏度: 150mV 輸入對應(yīng)18W輸出 頻率響應(yīng): 30Hz 到 20KHz -1dB THD @ 1KHz: 0.1W 0.02% 1W 0.01% 5W 0.01% 10W 0.03%
THD @10KHz: 0.1W 0.04% 1W 0.05% 5W 0.06% 10W 0.15%
功放電路圖:
器件清單:
P1 = 22K Log.Potentiometer (Dual-gang for stereo)
R1 = 1K 1/4W 電阻
R2 = 4K7 1/4W 電阻
R3 = 100R 1/4W 電阻
R4 = 4K7 1/4W 電阻
R5 = 82K 1/4W 電阻
R6 = 10R 1/2W 電阻
R7 = R22 4W 電阻
R8 = 1K 1/2W 微調(diào)電阻
C1 = 470nF 63V 薄膜電容
C2,C5 = 100΅F 3V 鉭電容
C3,C4 = 470΅F 25V 電解電容
C6 = 100nF 63V 薄膜電容
D1 = 1N4148 75V 150mA 二極管
IC1 = TLE2141C 低噪聲高電壓運放
Q1 = BC182 50V 100mA NPN 三極管
Q2 = BC212 50V 100mA PNP 三極管
Q3 = TIP42A 60V 6A PNP 三極管
Q4 = TIP41A 60V 6A NPN 三極管
J1 RCA 音頻輸入端子
R9 = 2K2 1/4W 電阻
C7,C8 = 4700΅F 25V 電解電容
D2 100V 4A 整流橋
D3 5mm. 紅色發(fā)光二極管
T1 220V 初級輸入, 15 + 15V 次級25W電源變壓器
Notes:
Can be directly connected to CD players, tuners and tape recorders.
Don't exceed 23 + 23V supply.
Q3 and Q4 must be mounted on heatsink.
D1 must be in thermal contact with Q1.
Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
Adjust R3 to read a current between 20 to 30 mA with no input signal.
To facilitate current setting add R8 (optional).
A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of J1, P1, C2, C3 &C4. Connect C6 at the output ground.
Then connect separately the input and output grounds at the power supply ground.
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