Digital Electronics Notes, lectures for engineering and diploma students

Pulse Generator

A device that produces an electrical discharge at regular intervals, which can be modified as needed, as in an electronic pacemaker.


The printer is an ouput device which gives the hard copy of the data or graphics stored in the memory of computer. There are two main types of printers.

Digital Multiplexing

Digital Multiplex System (DMS) is the name shared among several different telephony product lines from Nortel Networks for wire line and wireless operators

Decoder & Encoder

Decoder is a circuit which converts the digital signal into analog signal. Its input will be in digital form while the output will be a continuous sine wave or analog wave.


A comparator is a device which is used to sense when an arbitrary varying signal reaches some threshold or reference level.

Chopper Amplifier

Let us assume that we are required to amplify a small signal say of the order of millivolt and that the signal v(t) is one in which change in volt with respect to time i.e.