Sunday, January 8, 2012

50W Audio Amplifier Circuit

50W Audio Amplifier Circuit

Here the 50W audio amplifier circuit diagram. The amplifier is based ICL8063. This a good amplifier circuit which is easy enough to built.. This circuit can be connected by radio, TV, stereo or other devices.

The circuit is also featured with inputs for the record player, guitar, microphone, and others. If you add low pass filter at the input, it will work like a mini-subwoofer. Circuit scheme presented will guide you in 50W amplifier construction, good luck.

The power supply is splitted type, already added on above circuit diagram.

Components List:

R1 = 200R 1/4W
R2 =200K 1/4W
R3 = 30K 1/4W
R4 = 1K 1/4W
R5 = 5K 1/4W
R6, R9 = 1M 5% 1/2W
R7, R8 = 0,4 ohm 5W
R10 = 10K Pot
R11, R12 = 51K 1/4W
R13 = 47K 1/4W
C4, C6, C5, C7, C8 = 1nF
C9 = 50pF
C10 = 0,3uF
C11, C12 = 10000uF/50V
U1, U2 = IC 741 Op Amp
U3 = ICL8063
Q1 = 2N3055 NPN Power Transistor
Q2 = 2N3791 PNP Power Transistor
D = 250V 6A Bridge Rectifier
T = 50V Center Tapped 5A Tranformer
C1 = 100uF/35V
F1 = 2A Fuse
C2 = 11nF
SPEAKER = 8 ohm 50W
C3 = 3750pF
Heatsinks For Q1 and Q2

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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