AUDIO_MIXER

Published:2009/7/17 3:17:00 Author:Jessie | From:SeekIC

An audio mixer is a handy circuit that will combine two or more audio signal sources into one signal channel. The figure shows an audio mixer that is built around the LM3900 CDA. The crux of this circuit is the three input networks, principally R3, R4, and R5. These resistors are connected to different input sources (labeled VIN1,VIN2, and VIN3). Those three resistors all connect to the inverting input of the CDA. The gain is approximately AV=R2/Rxwhere Rx is the value of any one input resistor. The output voltage is Vo=R2[(VIN1/R3)+(VIN2/R4)+(VIN3/R5)If resistor R2 is made variable, then the potentiometer used for R2 will serve as a master gain control for the audio mixer.



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