3--- OPAMPS and COMPARATORS (IC741, LM324 etc)

As the name implies it is an operational amplifier. It performs mathematical operations like addition, subtraction, log, antilog etc. OPAMPS can amplify both AC and DC signals. The 741 has two inputs and one output. The difference between these two inputs is amplified and that is what appears at the output. We can get good amplifier gain in OPAMPS. The most commonly used OPAMPS are 741 and 324. IC741 is used in close loop configuration and LM324 in open loop configuration. i.e. LM324 mainly used as comparator while 741 for amplification, addition etc...











Now here we need negative voltage in some cases. That seems impossible with batteries right?? But it is not so. Let us discuss the Voltage Regulators in details.