Electronics - Basic Op-Amp Circuits - Discussion
Discussion Forum : Basic Op-Amp Circuits - Filling the Blanks (Q.No. 1)
1.
In the given circuit, VIN1 equals ______.
Discussion:
2 comments Page 1 of 1.
Vijay said:
1 decade ago
It is a summing amplifier.
Vout = - (v1+V2+v3+.... ).
Vout = - (v1+V2+v3+.... ).
(1)
Benj said:
1 decade ago
Vo= -Vin*(Rf/Rin) --1
As the inverting input resistors are arranged in parallel
1/Rin= 1/24K + 1/24K+ 1/24K
1/Rin= 3/24K
Rin= 24K/3=8K --2
Apply Rin value in eqn 1
+12= -Vin*(24K/8K)
+12= -Vin*(3)
Hence Vin= -4V
As the inverting input resistors are arranged in parallel
1/Rin= 1/24K + 1/24K+ 1/24K
1/Rin= 3/24K
Rin= 24K/3=8K --2
Apply Rin value in eqn 1
+12= -Vin*(24K/8K)
+12= -Vin*(3)
Hence Vin= -4V
(2)
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