Summing Amplifier by LM741

Summing Amplifier by LM741
The summing amplifier is a handy circuit. It are a type of operational amplifier circuit and an inverting amplifier mode. You can add several voltages input together. More than two inputs can be used.
In circuit:
Vout = -R4 ((Vin1/R1) + (Vin2/R2))
When R1 = R2 .
Vout = – R4/R1 (Vin1+Vin2)
When R1=R2=R4 .
Vout = – Vin1 + Vin2

We seen the information in http://en.wikipedia.org/wiki/Summing_amplifier#Summing_amplifier .

An audio mixer circuit is another good example of the summing sounds from different channels together, before send the combined signal to next an amplifier circuit.

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