ElexTutorials

What is a signal generator with its functions, types, and applications?

The signal generator is a kind of test equipment used to generate waves (sine wave, square wave, triangular wave) or electrical standard test signals. It is also called an oscillator because it generates periodic signals. It can provide different types of waves depending on the application, these waves are mainly used in test instruments, development systems, etc. There are different types of signal generators available, each type is used to generate different kinds of signals such as audio signals, RF signals, pulse signals, analog, digital, etc.

Types of Signal Generators

Signal generators are classified into different types on the basis of capacity and function. These are available in different dimensions, and parameters with designs. Generators are used to generate an infinite number of signals to reach various purposes and debug challenges.

AF Sine and Square Wave Generator.
Arbitrary Waveform Generator.
RF Signal Generator.
Audio Signal Generator.
Video Signal Generator.
Function Generator.
Pulse Generator.

Multimeter with their functions, types, and applications

Multimeters are widely used in measurement technology. The multimeter can measure various electrical quantities like resistance, AC and DC voltage, current, capacitance, etc. at one go. Voltmeter, ammeter, and millimeter are combined in a multimeter, which is also called VOM (Volt-Ohm Millimeter). Multimeters may also have different capabilities, for example, diode testing, coherence testing, transistor testing, TTL logic testing, and repetition testing. This device plays an important role in finding the problems present in the circuit so that those problems can be easily rectified.

It is a handheld device with positive and negative indicator needles on a numerical LCD digital display. Multimeters can be used to test batteries, household wiring, electric motors, and power supplies.

The essential parts of a multimeter mainly consist of a display, power source, probe and control.

A junction field effect transistor is a type of FET used as a switch that can be controlled electrically. The junction field effect transistor is opposite the bipolar junction transistor. JFETs are voltage-controlled devices. In JFET, the current flow is mostly due to charge carriers. Whereas, in BJT, the current flow is due to both minority and majority charge carriers. Only most of the charge carriers are responsible for the current flow. JFETs are unidirectional. The first working model of the junction field-effect transistor was made in 1953.

Operation of Junction Field Effect Transistor

The working of a JFET can be compared to a garden hose pipe. If there is no blockage then water flows easily through the garden hose pipeline, but if we bend the pipe a bit, the water flow slows down. This is how JFET works. Here the hose is in line with the JFET, and the water flow is equal to a current. We control the current flow by constructing the current carrying channel as per our requirement.

Junction field effect transistors are generally classified into two types based on the source of current flow and they are:

N-channel Junction Field Effect Transistor.
P-channel Junction Field Effect Transistor.