Thursday, November 12, 2009
18Watt Power Amplifier circuit is quite simple and does not require a lot of components to make it. 18 Watt Power Amplifier can be directly connected to the CD player, MP3 player or other audio devices without having to use a pre-amp tone control type. Because the OCL type amplifier, the frequency response produced by 18-watt amplifier is very good. Circuit Power Amplifier 18Watt you can see in the picture below.
List Component
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
Note:
- Q3 and Q4 should be cooler or heatsink.
- Good Grounding very influential, if not better then the grounding of the power amplifier hum will be heard. Ground A1, P1, C2, C3 & C4 are connected to a ground point, while the ground is connected at point C6 output ground.
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