Operational amplifiers have so many exciting apps, and we have created many circuits with op-amps. Operational amp. In this article, we will study one other Op-amp application, adding two or more input voltages, and the circuit is called Summing or Opamp Adder. Here we are to show the Adder Circuit by using Opamp LM358.
Hardware Component
The following components are required to make Summing Amplifier Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Digital Multimeter DMM for testing | – | 1 |
| 2. | Two Input voltage sources (their sum should be < supply voltage) | – | 1 |
| 3. | Dual-Operational Amplifiers | LM358 | 1 |
| 4. | Resistor | 1KΩ | 4 |
| 5. | Power supply (for opamp +Vcc & -Vcc) | 9 Vdc | 1 |
LM358 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of LM358
Summing Amplifier Circuit
Circuit Operation
Inverting adder is similar to the above amplifier, where any input voltages of the inverting terminal are supported but where the non-inverting terminal is focused, but there are several inputs on their inverting terminal that differ from that of the Inverting Adder circuit. The Inverting Adder Circuit can be seen here with two inputs on the inverting input.
The non-inverting terminal is grounded. And the voltage at point B will be the same as the voltage at point A, 0V, as seen in a closed-loop structure, which indicates that current I1 and I2 will be passing into resistor Rf (higher potential) rather than into the inverting terminal (lower potential) of the Op-amp. The production of the output voltage is now the sum of the inputs and is negative since the input provides the non-inverting terminal.
Here you can see the practical implementation of the LM358 Opamp adder circuit including two separate batteries, a sum of two input voltages (alternate voltage 4 Vdc and ~2.6 Vdc), and you can see in Multimeter the sum of two input voltages (6.89v).
Applications and Uses
The term summing amplifier is used to add two signal voltages. The voltage adder circuit is simple to recognize and allows multiple signals to link together. Of that kind, amplifiers are used in a variety of electronic circuits.
