An LM741 operational amplifier is a DC-coupled high gain electronic voltage amplifier. It has only one op–amp inside. An operational amplifier IC is used as a comparator which compares the two signal, the inverting and non-inverting signal.
| Pin Number | Pin Name | Description |
| 1 , 5 | OFFSET NULL | Pin used for remove the offset voltage and balance input voltage. |
| 2 | INPUT- | Inverting signal Input |
| 3 | INPUT+ | Non-Inverting signal Input |
| 4 | V- | Ground or Negative Supply Voltage |
| 6 | OUTPUT | Output of op amp |
| 7 | V+ | Positive Supply Voltage |
| 8 | NC | Not connected |
