วงจรมิกเซอร์(Mixer circuit)

R1, R3  10K Pot 
R2, R4  100K 1/4 W Resistor 
R5  6.8K 1/4 W Resistor 
C1, C2, C3  0.1uF Capacitor 
Q1  2N3819 Junction FET

วงจรมิกเซอร์ 100MHz(Mixer circuit 100MHz)

วงจรมิกเซอร์ 6 input(Mixer circuit 6 input)

IC = ua741
The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS. The mic inputs are amplified about 100 times or by 40dB, the total gain with the mixer is 46dB. The mic input is designed for microphones with outputs of about 2mV RMS at 1 meter. Most microphones meet this standard.

วงจรมิกเซอร์(2input)ใช้เฟท(Mixer circuit 2input using Fate.)

R1, R3 10K Pot
R2, R4 100K 1/4 W Resistor
R5 6.8K 1/4 W Resistor
C1, C2, C3 0.1uF Capacitor
Q1 2N3819 Junction FET