This is simple mixer was designed for three dynamic microphones, but can be re-designed for more or less. Level and tone controls are available to tailor the sound to your needs. This is the figure of the circuit;
In this circuit R1-R3 are level controls. R9 and R11 control bass and treble, respectively. Since the circuit draws such low current, two 9V batteries can be used for a power supply. This circuit is based on op amp 741 IC.
Part:
R1, R2, R3 1K 1/4W Resistor
R4, R5, R6 10K Logarithmic Pot
R7 1Meg 1/4W Resistor
R8, R10 10K 1/4W Resistor
R9, R11 100K Linear Pot
C1, C2, C5, C6 0.1uF Ceramic Disc Capacitor
C3, C4 22nF Ceramic Disc Capacitor
U1, U2 741 Op Amp
J1, J2, J3 Input Jacks Of Your Choice
MISC Board, Wire, Knobs, IC Sockets
In this circuit R1-R3 are level controls. R9 and R11 control bass and treble, respectively. Since the circuit draws such low current, two 9V batteries can be used for a power supply. This circuit is based on op amp 741 IC.
Part:
R1, R2, R3 1K 1/4W Resistor
R4, R5, R6 10K Logarithmic Pot
R7 1Meg 1/4W Resistor
R8, R10 10K 1/4W Resistor
R9, R11 100K Linear Pot
C1, C2, C5, C6 0.1uF Ceramic Disc Capacitor
C3, C4 22nF Ceramic Disc Capacitor
U1, U2 741 Op Amp
J1, J2, J3 Input Jacks Of Your Choice
MISC Board, Wire, Knobs, IC Sockets
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