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گروه الکترونیک فنی حرفه ای و کاردانش هنرستان
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پیوندهای روزانه
آمار وبلاگ
  • تعداد بازدیدکنندگان: 800595
یکشنبه 3 دی‌ماه سال 1391 :: 08:06 ب.ظ ::  نویسنده : مدیر وبلاگ

اطلاعات بیشتر در ادامه مطلب



Amplifier parts:

P1 = 22KLog.Potentiometer (Dual-gang for stereo)
R1 = 1K1/4W Resistor
R2 = 4K71/4W Resistor
R3 = 100R1/4W Resistor
R4 = 4K71/4W Resistor
R5 = 82K1/4W Resistor
R6 = 10R1/2W Resistor
R7 = R224W Resistor (wirewound)
R8 = 1K1/2W Trimmer Cermet (optional)
  
C1 = 470nF63V Polyester Capacitor
C2,C5 = 100µF3V Tantalum bead Capacitors
C3,C4 = 470µF25V Electrolytic Capacitors
C6 = 100nF63V Polyester Capacitor
  
D1 = 1N414875V 150mA Diode
  
IC1 = TLE2141CLow noise,high voltage,high slew-rate Op-amp
  
Q1 = BC18250V 100mA NPN Transistor
Q2 = BC21250V 100mA PNP Transistor
Q3 = TIP42A60V 6A    PNP Transistor
Q4 = TIP41A60V 6A    NPN Transistor
  
J1RCA  audio input socket



Power supply parts:

R9 = 2K21/4W Resistor
  
C7,C8 = 4700µF25V Electrolytic Capacitors
  
D2100V 4A Diode bridge
D35mm. Red LED
  
T1220V Primary, 15 + 15V Secondary 50VA Mains transformer
  
PL1Male Mains plug
  
SW1SPST Mains switch


 

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.


Technical data: 

Output power: 18 Watt RMS @ 8 Ohm (1KHz sinewave) 

Sensitivity: 150mV input for 18W output 

Frequency response: 30Hz to 20KHz -1dB 

Total harmonic distortion @ 1KHz:  0.1W 0.02%    1W 0.01%    5W 0.01%   10W 0.03% 
Total harmonic distortion @10KHz: 0.1W 0.04%    1W 0.05%    5W 0.06%   10W 0.15% 

Unconditionally stable on capacitive loads 
 



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