Different Types of Switches, Circuits & Applications

A switch is an electrical device by which the circuit is interrupted or set manually or automatically. The principle of operation of the switch depends on the on / off mechanism. Potatoes use various electrical or electronic circuit breakers to control or activate the circuit. The types of switches depending on the connections they make to the circuit. Two essential components, such as pole and continuity, can verify the type of contact the switch can make. Both of these components are also used to describe different types of switch contacts.

Sticks and throwing can be defined here. When the number of circuits controlled by a switch is controlled, it is called a pole, while the throw can be defined as the number of positions the switch can occupy. A one-stroke switch is a pair of contacts such as opening or closing. A double switch has a connection that can be connected to two other connections. When the switch is turned on, current flows between the two terminals of the switch. When the switch is in the off position, there is no current flow between the two terminals of the switch.

Switch Types

The switch type is classified into four types, viz.

  • Unipolar unipolar (SPST)
  • Single pole double throw (SPDT)
  • Two poles, one launch (DPST)
  • Two poles double throw (DPDT)

SPST (unipolar unipolar)

SPST is a basic on / off switch used to connect or disconnect between two terminals. Power to the owl circuit is via this switch. A simple PST switch is shown below.

The SPST switch applies to the light switch below and is also known as a toggle switch. This light switch controls the circuit wire and makes the connection. This is an on / off switch. When the switch in the lower circuit is on or off, the current flows through the two terminals and the bulb in the circuit turns on. When the switch is on or off, there will be no flow through the two existing terminals.

SPDT (single pole double throw)

The SPDT switch is a three-port switch, one port is used as an input and the other two as an output. Connect a common terminal with one or two of the other terminals. In the SPDT switch, use only the COM terminal instead of the other terminals. For example, we can use COM & B or COM & A.

The SPDT switch is mainly used in a three-way circuit to turn the light on and off in two places, e.g. B. Up and down the stairs. When switch A is closed in the following circuit, current flows through the terminals, but only light A turns on and light B goes out. When switch B is turned off, current flows through the terminals and only light B turns on and light “A” turns off. Both circuits are controlled by a source or a path.

DPST (double pole, one throw)

A DPST switch consists of two poles, which means it has two identical switches arranged next to each other. This switch is operated by a single toggle switch, which means that two discrete circuits are controlled simultaneously by a single push.

This switch is used to turn two circuits on and off and has four connections, i.e. two inputs and two O / PS. The main purpose of this switch is to regulate the device at 240V where both the supply voltage and the unbroken cable can always be connected must be. When this switch is on, it goes through two existing circuits and when it is off, it is turned off.

DPDT (double pole double throw)

This switch is like two SPDT switches, that is, two separate circuits that connect the 2 inputs of every circuit to at least one of the 2 outputs. The switch position controls the number of paths and each contact can be routed with two contacts.

In on-on or on-off-on mode, they function as two discrete SPDT switches operated by a similar actuator. Only two loads can be switched at a time. The DPDT switch can be used in any application that requires an open and closed cabling system.

An excellent example of this is in model railroading, which uses small railways and trains, cars and bridges. By shutting down the system, the system can be changed at any time, while additional parts can be activated or activated by the relay when opened. The following circuit connections A, B and C are made from one pole of the switch and D, E and F are connected to the other pole of the switch. Connections B and E are interconnected in each pole.

When Vs enters connection B and the switch is connected to the up position, the connection becomes A + ve and the motor rotates in one direction. When the switch is in the lowest position, the power is reversed and the connection is D + ve, so the motor rotates in the opposite direction. In the center position, the power supply is not connected to the motor and does not turn. This type of switch is mainly used in many motor controls where you want to reverse the motor speed.

Special applications via touch control
Touch the controlled load switch
The main goal of this project is to develop a touch-driven load switch. This project uses 555 timers in mono mode to run the relay and activate the load for a fixed period of time.

The 555 timer IC is activated by a touch plate attached to its activation pin. The output of the 555 will be greater for the specified time interval as determined by the RC time constant associated with the timer.

This output controls a relay, which causes the load to turn on and off for a period of time. Turning on the timer increases the voltage on the touch panel.

Tap the controlled musical bell

When someone touches the touch panel in the circuit, the circuit produces a musical tone. This circuit uses two AA cells and produces a lot of noise.

The proposed circuit uses UM 3481 IC which is used in music circuits. This IC includes a ROM consisting of 512 musical tones, a tone generator, a ROM consisting of 512 musical tones, a rhythm generator, a drain controller, a modular, oscillators, preamps and frequency distribution.

Some basic components are needed to design this circuit. In this circuit, R1 and C1 act as time components for the isolator. Transistor Q1 is used to control the speaker. The base connection of the Q2 transistor is used as the touch panel display to activate the music bell.

So it comes to types of switches and special applications with touch control. We hope you understand this concept better. If you have any questions about this topic or the applications of the Touch-enabled Switch project, please provide your feedback by commenting in the comments section below. A question for you here is what are the other uses of touch units?

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