Components Part:
R1, R2, R3 = 1K
R4, R5, R6 = 10K Logarithmic Pot
R7 = 1M
R8, R10 = 10K
R9, R11 = 100K Linear Potensiometer
C1, C2, C5, C6 = 100nF
C3, C4 = 22nF
U1, U2 = IC 741 Op-Amp
J1, J2, J3 = Input Mic Jacks
MISC = Board, Wire, Knobs, IC Sockets
Mic Audio Mixer Circuit Notes:
- R1-R3 are volume level control on each input. R9 and R11 will control bass and treble for all input.
- The circuit only need low current to run, two 9V batteries which connected in parallel can be used for a power supply.
- The placement of the mixer in a metal case and connected the ground to the case will cut down on noise.
Circuit Source: aaroncake.net
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 wikipedia.org
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 wikipedia.org
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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