This is the circuit diagram of 18W audio amplifier. The circuit is quite simple and inexpensive to built. It uses a pair of power transistor TIP41A and TIP42A for single channel operation. The power supply used for this circuit is dual polarity (splitted) power supply, use center tap transformer to build this kind of power supply.
Parts list:
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 = 100?F | 3V Tantalum bead Capacitors |
C3,C4 = 470?F | 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 = 4700?F | 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 switc |
18W Audio Amplifier Circuit Notes:
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is 18w loud enough?
of course it will loud enough for your room... but not enough for outdoor sound system.