مدار تقویت کننده صوت 18 وات

اطلاعات بیشتر در ادامه مطلب

Amplifier parts:

P1 = 22K	Log.Potentiometer (Dual-gang for stereo)
R1 = 1K	1/4W Resistor
R2 = 4K7	1/4W Resistor
R3 = 100R	1/4W Resistor
R4 = 4K7	1/4W Resistor
R5 = 82K	1/4W Resistor
R6 = 10R	1/2W Resistor
R7 = R22	4W Resistor (wirewound)
R8 = 1K	1/2W Trimmer Cermet (optional)
C1 = 470nF	63V Polyester Capacitor
C2,C5 = 100µF	3V Tantalum bead Capacitors
C3,C4 = 470µF	25V Electrolytic Capacitors
C6 = 100nF	63V Polyester Capacitor
D1 = 1N4148	75V 150mA Diode
IC1 = TLE2141C	Low noise,high voltage,high slew-rate Op-amp
Q1 = BC182	50V 100mA NPN Transistor
Q2 = BC212	50V 100mA PNP Transistor
Q3 = TIP42A	60V 6A    PNP Transistor
Q4 = TIP41A	60V 6A    NPN Transistor
J1	RCA  audio input socket

Power supply parts:

R9 = 2K2	1/4W Resistor
C7,C8 = 4700µF	25V Electrolytic Capacitors
D2	100V 4A Diode bridge
D3	5mm. Red LED
T1	220V Primary, 15 + 15V Secondary 50VA Mains transformer
PL1	Male Mains plug
SW1	SPST 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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