学校地址:湖南省 长沙市 雨花区 车站南路红花坡路口 |
学校地址:湖南省 长沙市 雨花区 车站南路红花坡路口 |
功放技术指标 输出功率: 18 Watt RMS @ 8 Ohm (1KHz sinewave) 灵敏度: 150mV 输入对应18W输出 频率响应: 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%
功放电路图:
器件清单:
P1 = 22K Log.Potentiometer (Dual-gang for stereo)
R1 = 1K 1/4W 电阻
R2 = 4K7 1/4W 电阻
R3 = 100R 1/4W 电阻
R4 = 4K7 1/4W 电阻
R5 = 82K 1/4W 电阻
R6 = 10R 1/2W 电阻
R7 = R22 4W 电阻
R8 = 1K 1/2W 微调电阻
C1 = 470nF 63V 薄膜电容
C2,C5 = 100΅F 3V 钽电容
C3,C4 = 470΅F 25V 电解电容
C6 = 100nF 63V 薄膜电容
D1 = 1N4148 75V 150mA 二极管
IC1 = TLE2141C 低噪声高电压运放
Q1 = BC182 50V 100mA NPN 三极管
Q2 = BC212 50V 100mA PNP 三极管
Q3 = TIP42A 60V 6A PNP 三极管
Q4 = TIP41A 60V 6A NPN 三极管
J1 RCA 音频输入端子
R9 = 2K2 1/4W 电阻
C7,C8 = 4700΅F 25V 电解电容
D2 100V 4A 整流桥
D3 5mm. 红色发光二极管
T1 220V 初级输入, 15 + 15V 次级25W电源变压器
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.