The power supply must be well regulated and free from any sort of noise.The circuit can be powered from anything between 5 to 30V DC.Assemble the circuit on a good quality PCB.The main features of this audio mixer circuit as compared to the other audio mixers are given below.ġ) Wide range of supply voltage input (4volt to 32volt)Ģ) Dual voltage supplies also adoptable (+/- 2.2volt to +/-16volt)Ĥ) Providing very high open loop gain(70dB) LM3900 pin configuration and architecture The architecture and pin configuration of LM3900 is shown in the picture below. These amplifiers provide a wide range of voltage inputs and very good response for all audio frequencies.
LM3900 series amplifiers consist of four independent and internally compensated amplifiers that are designed for single and wide power supply voltage.
