The term operational amplifier (Op. Amp.) refers to high gain dc amplifier that has a differential input (two input leads) and a single ended output (one output lead). Op. Amps. have characteristics such as high input resistance, low output resistance, high gain, low drift etc., that make them highly suitable for many applications and therefore, wide spread use in electronic circuits.

The experimental set-up on the study of Op. Amp. consists of a 741 IC with facilities for convenient connections, two regulated power supplies (±12V), a variable voltage source and a multirange digital voltmeter with 3½ digit LED display.

The resistances (0.1% metal film) required are mounted on the board separately, which may be connected as and when required through patch chords. The student can also connect external components, if required.

The following studies can be carried out

• Working of the basic circuit
• Measurement of bias and offset currents
• Study of inverting and non-inverting amplifier configurations
• Introduction to amplifier drift

The above experimental set-up has been laid down on a decorated bakelite board with an aim of providing an easy understanding to the students. All components are well spread out for clarity and easy repairs and replacement. The set-up is provided with a booklet, which contains its detailed theory of operation, description, specifications, suggestions and discussion on the various experiments that may be performed with it.

The set-up is complete in all respect.