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VARY THE INPUT VOLTAGES, THEN THE OUTPUT VOLTAGE IS THE SUM OF THE INPUT VOLTAGES.
i.e.,
Vo=V1+V2+V3
You can use it on Ac supply but beware of the direction of supply and phase angle of the supply.
There are two sets in this circuit:
1) An inverting amplifier with multiple inputs.
2) A signal inverter.
1) The Inverting amplifier:
The output of the inverting amplifier:
Vo=Vin*(Rf/Rin) →Equation 1
Since there are multiple inputs,
Vo=Rf(V1/Rin1 + V2/Rin2 + V3/Rin3)
But to ensure that this circuitry is not made to work as an amplifier, we need to make Rf=Rin=10Ω in Equation 1.
So the output will be only the sum of the inputs.
To gain some huge current, i used 10Ω for both Rin and Rf.
Since there are multiple inputs, Rin1=Rin2=Rin3=Rf=10Ω
2) The Signal Inverter:
The signal inverter is an inverting amplifier where there is no amplification, while inverting the signal.
Vo=Vin.
Note:
Here, Rin=Input Resistance
Rf=Feedback resistance.
Vo=Output Voltage(I entered this because in some cases, Vo is the initial voltage)
Vin=Input voltage
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