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LM3900 Audio Mixer Circuit Diagram

2016-01-04 02:37  
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This audio mixer circuit doesn’t use a low impedance input to mix no ideal sources, but use many amplifiers to provide ideal sources before mixed through simple resistors.

Ideal source means a sources with low impedances, make the interaction between signals in the output doesn’t affect the input. Please note that this mixer circuit has high impedance output, so you’ll need an next processing equipment with appropriate input specs. This audio mixer circuit is designed around an LM3900 quad op amp and combines 2 line and 2 mike inputs and sums them at the output terminal. To vary the gain (around +23 dB), we can change the R7 through R10.

LM3900 Features:

Wide single supply voltage 4 VDC to 32 VDC Range or dual supplies g2 VDC to g16 VDCSupply current drain independent of supply voltageLow input biasing current 30 nAHigh open-loop gain 70 dBWide bandwidth 2.5 MHz (unity gainLarge output voltage swing (Va b 1) Vp-pInternally frequency compensated for unity gainOutput short-circuit protectionLM3900 Audio Mixer Circuit Diagram