What is Operational amplifier and timer.Definition of IC555 timer ic.

Definition: IC555 is known as a timer IC. However, he does not make time sense.  It works just like a simple transistor on / off switch.

Use RC circuit to generate voltage varying over time do.  The IC is designed to keep the resistor and capacitor prices variable.

Operational Amplifier : The operational amplifier is called the op amplifier. the op amplifier is a direct coupled amplifier with high gain.  It has two inputs and one output. Nevertheless, basically uses it as a single-ended input - single-ended output.  In the single ended method one terminal is connected to the input or output and the other to the terminal ground. Differentiation is its first stage.  The operational amplifier can perform many mathematical operations. E.g.  Sum, subtraction, integration, differential, voltage comparison, AD conversion, etc.  Op Amplifiers are used in analog computers.

Operational amplifiers IC numbers:
1. LM741,LM741C,LM741A.
2. LM 12
3. LM 318
4. LM 747C
5. LM 348.

Characteristics of Ideal Op. Amplifier:
1. Open loop gain is Infinity.
2. The input impedance is infinity.
3. Output impedance is zero.
4. The input bias current is zero.
5. The input offset current is zero.
6.  Input offset voltage is zero.
7. Common mode rejection ratio is (infinity).
8. Frequency response graph is zero to infinity frequency.
9. Time for response is zero.
10. It also amplifies the AC and DC signal.

Use of operational amplifier: Operational Amplifier uses are divided into two types.
Linear usage: - In which the waveforms of the input and output are almost identical, they are called Linear Utility. These include Cutting Operational Amplifier
1. Inverting operational amplifier
2. Non inverting operational amplifier
3. Inverter
4. Buffer
5. Adder
6. Subtractor.

Non-linear use:  in which input and output waveforms are various forms, called the use of non-linear.  In this,
1. Comparator
2. Shmitt trigger.