Hello
Please look at the following picture,it’s a simple multi-channel audio mixer circuit using LM3900 quad amplifier. Here it consists of 4 channel quad amplifier (LM3900) while the two mic audio inputs and two direct line inputs are available in this circuit.By adding the same circuit parallel with this, you can increase the number of inputs according to the applications. Each input is connected to the inverting terminal of LM3900. The built in amplifier of each section amplifies every audio input separately and is fed to the output terminals. The output terminal from each channel is connected to a single output line with a resistance not greater than 680K and produces a mixed audio at the output with very low noise. This audio mixer circuit doesn’t use a low impedance input to mix ideal*sources. Capacitors C1 to C4 are the decoupling capacitors for the corresponding channels. C5 is the output decoupling capacitor.The
I want to ask the following questions:
1).Can it be powered from anything if the DC over 40V ?
2).Is the power supply normal if there are any sort of noise?
3).Can I use dual voltage supplies here?
Please look at the following picture,it’s a simple multi-channel audio mixer circuit using LM3900 quad amplifier. Here it consists of 4 channel quad amplifier (LM3900) while the two mic audio inputs and two direct line inputs are available in this circuit.By adding the same circuit parallel with this, you can increase the number of inputs according to the applications. Each input is connected to the inverting terminal of LM3900. The built in amplifier of each section amplifies every audio input separately and is fed to the output terminals. The output terminal from each channel is connected to a single output line with a resistance not greater than 680K and produces a mixed audio at the output with very low noise. This audio mixer circuit doesn’t use a low impedance input to mix ideal*sources. Capacitors C1 to C4 are the decoupling capacitors for the corresponding channels. C5 is the output decoupling capacitor.The
I want to ask the following questions:
1).Can it be powered from anything if the DC over 40V ?
2).Is the power supply normal if there are any sort of noise?
3).Can I use dual voltage supplies here?
