50 watt amplifier circuit diagram
Source: InternetPublisher:D先生 Keywords: Amplifier circuit audio amplifier Updated: 2024/07/12
This is a general purpose 50 watt audio amplifier that can be easily built. The amplifier can be used to amplify the output of a radio, TV, stereo, or other audio device. It can also be a final amplifier for a record player, guitar, microphone, or other unamplified signal source. With the addition of a low pass filter on the input, it becomes a nice little subwoofer amplifier.
Circuit components
R1 200 ohm 1/4 W resistor
R2 200K 1/4 W resistor
R3 30K 1/4 W resistor
R5 1K 1/4 W resistor
R6 5K 1/4 W resistor
R7, R10 1 megohm (5%) 1/2 W resistors
R8, R9 0.4 ohm 5 W resistors
R11 10K potentiometer
R12, R13 51K 1/4 W resistor
R14 47K 1/4 W resistor
C1 35V 100uF electrolytic capacitor
C2 0.011uF capacitor
C3 3750pF capacitor
C4, C6 1000pF capacitor
C5, C7, C8 0.001UF capacitor
C9 50PF capacitor
C10 0.3uF capacitor
C11, C12 10,000 UF 50V electrolytic capacitor
U1, U2 741 operational amplifier
U3 ICL8063 Audio Amplifier
Q1 2N3055 NPN power transistor
Q2 2N3791 PNP power transistor
notes
1 I know I skipped R4. That's not a problem :-)
2 100HZ input distortion is less than 0.1%, 20kHz input increases to about 1%.
3 I have not been able to find a suitable T1 (transformer). You can use two 24V 5A units in series.
4 Q1 and Q2 will require heat sinks.
5. Find U3 (ICL8063 Audio Amplifier IC), you may have trouble finding it because it is discontinued.
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