Question

An opamp is working as an adder in which it consists of three resistances such as 50 ohm, 30 ohm and 20 ohm respectively. Three voltages are applied to these resistances in according to all resistances as 100v, 150v and 200v respectively. Then compose an adder and evaluate the total output voltage if it is having feedback resistance of 300ohm.​

Answer 1

Explanation:

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Answer 2

Answer: The output voltage is -5100V.

Given:

• Three resistances such as 50 ohm, 30 ohm and 20 ohm.
• Applied voltages 100V, 150V and 200V.
• Feedback resistance 300ohm.

To Find: Total output voltage.

Explanation:

Step 1: Op-amps, as operational amplifiers are more often known, are one of the fundamental components of analogue electronic circuits.

In essence, an operational amplifier is a three-terminal apparatus with two high impedance inputs. The Inverting Input is one of the inputs, and it is identified by a "minus" or negative sign ( – ). The second input is referred to as the Non-inverting Input and is denoted by a plus sign (+).

Step 2: Another operational amplifier circuit design used to integrate the voltages found on two or more inputs into a single output value is the summing amplifier.

Step 3: The output voltage ($V_{out}$) in this simple summing amplifier circuit is now proportional to the sum of the input voltages ($V_1, V_2, V_3$, etc.). The initial equation for the inverting amplifier may then be changed as follows to account for these new inputs:

$-V_0 = V_1(\frac{R_f}{R_1})+V_2(\frac{R_f}{R_2})+V_3(\frac{R_f}{R_3})\\\\-V_0 = V_1(\frac{300}{50})+V_2(\frac{300}{30})+V_3(\frac{300}{20})\\\\-V_0 = 600+1500+3000\\\\V_0=-5100V$

Hence, the output voltage is -5100V.

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