This is a 3 input mic mixer circuit
using IC LM 741. Four 741s are used here. IC1, IC2, IC3 are used as
preamplifiers. They produce a gain of around 40 decibel to the
individual input signals. IC4 is wired as a summing amplifier to add the
signals from three preamplifiers.IC4 also gives a gain of around 5
decibel to the final output signal. Total gain of the system is around
45 decibel.
Note:
• Use+15/-15 V DC dual power for powering this circuit.
• All inputs and output must be connected with respect to the ground.
• Capacitors C1, C2 and C3 must be rated 10V and other capacitors must be 30V.
General Description
Lay out IC LM 741
The
LM741 series are general purpose operational amplifiers which feature
improved performance over industry standards like the LM709. They are
direct, plug-in replacements for the 709C, LM201, MC1439 and 748 in most
applications. The amplifiers offer many features which make their
application nearly foolproof: overload protection on the input and
output, no latch-up when the common mode range is exceeded, as well as
freedom from oscillations. The LM741C is identical to the LM741/LM741A
except that the LM741C has their performance guaranteed over a 0°C to
+70°C temperature range, instead of −55°C to +125°C.
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