Audio_mixer_or_selector

Published:2009/7/23 21:22:00 Author:Jessie | From:SeekIC

This circuit uses the four Norton amplifiers of an LM3900 to form an audio-mixing or selection circuit (Norton amplifier circuits are also shown in chapter 11). With this circuit,particular amplifiers can be gated off with dc-control signals applied to the (+) inputs. Amplifier 3 is active, with SW3 closed, while amplifiers 1 and 2 are driven into saturation by the +V input applied through the 5.1 -M resistors.



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