Try to assemble a touch button, the basis of which is the simplest amplifier, consisting of only two transistors.
The simplest tactile switch on two transistors
By touching the circuit terminals of such a homemade amplifier with your finger, you can have an electrical effect on the load, as it will be able to amplify even a very small current passing through your finger.
List of pieces :
Transistor bc547
5mm LEDs
1k resistor
Copper wire
5v battery
Simple Touch Sensitive Switch Circuit using 555 Timer & BC547 Transistor
Machines have been eliminating humans on job tasks for several centuries. As a human being, we definitely need certain actions to be done with a touch instead of pressing buttons. If you are the one looking for such a smart device then here is your halt. In this article, we will be discussing the simple touch sensitive devices that can be used to operate LEDs or any home appliances.
In simple words, it is a kind of circuit which can be operated or toggled just by a touch. This circuit turns ON and OFF an LED whenever it senses a touch. The best part of this circuit is that very few components are required for the construction. In addition, it is more superior to mechanical switches due to various factors that include:
Touch switches have an infinite life and thus reduce maintenance costs.
This switch does not need direct contact with metal and therefore completely eliminated the security risks.
Touch sensitive switch circuit gives a sleeker view to the devices like UPSs, Mixer-grinder.
There are a number of ways to design the circuit by using different microcontrollers, ICs or even with some transistors. Throughout this discussion, we will discuss the design process for some of the simplest touch sensitive circuits that can be designed easily and are cost effective.
Touch-Sensitive Switch Circuit Using 555 Timer IC
To design this highly durable Touch sensitive switch circuit, we are using a 555 Timer IC as the main component. Here, the touch plate triggers the output of the 555 Timer IC, whenever sense a touch. Before getting started with the design process of this project, let's give you a quick overview of the 555 Timer IC.
555 Timer IC
The 555 Timer IC generally operates in three different modes depending upon configuration namely A-Stable, Mono-Stable and Bi-Stable modes. This IC is one of the most popular and widely used for providing time delay, as an oscillator or as a flip-flop element. This 8 pin IC is one of the most commonly used IC in electronic components. Go through the below table to understand the different pins and function of 555 Timer IC.
Related Project: PCB Design of LED Flasher Circuit using 555 Timer. Step by step
Gather the following components before starting the design process of the circuit.
Required Components:
555 Timer IC
Touch-Plate (conductive material/Metal)
Capacitors: 10 μF, 0.01 μF
Resistors: 100 K ohm, 470 ohm
Connecting wires
LED
Circuit Diagram for Touch Switch using 555 Timer
Here, 555 Timer IC is configured in Monostable mode. We can use two pieces of a conductor to make the touch plate, connected with the trigger pin of 555 Timer IC and ground respectively. Pin 5 of 555 timer IC is connected with a capacitor of 0.01 μf. Pin 3 is connected with resistor R2 and Pin 8 is connected with 6V power supply.
Working
Whenever we touch the conductive plates of the touch sensor, the 555 Timer is triggered. The output pin goes high turning ON the LED for some time. You can also connect a buzzer in place of the LED. The pulse duration generated at the output pin entirely depends on the timing resistor and capacitor of the circuit connected at pins 6 and 7 of the 555 Timer IC. That means you can change the duty cycle of the output pulse by changing the value of capacitor C1. The disadvantage of the circuit is that it consumes more power
Try to assemble a touch button, the basis of which is the simplest amplifier, consisting of only two transistors.
The simplest tactile switch on two transistors
By touching the circuit terminals of such a homemade amplifier with your finger, you can have an electrical effect on the load, as it will be able to amplify even a very small current passing through your finger.
List of pieces :
Transistor bc547
5mm LEDs
1k resistor
Copper wire
5v battery
Simple Touch Sensitive Switch Circuit using 555 Timer & BC547 Transistor
Machines have been eliminating humans on job tasks for several centuries. As a human being, we definitely need certain actions to be done with a touch instead of pressing buttons. If you are the one looking for such a smart device then here is your halt. In this article, we will be discussing the simple touch sensitive devices that can be used to operate LEDs or any home appliances.
In simple words, it is a kind of circuit which can be operated or toggled just by a touch. This circuit turns ON and OFF an LED whenever it senses a touch. The best part of this circuit is that very few components are required for the construction. In addition, it is more superior to mechanical switches due to various factors that include:
Touch switches have an infinite life and thus reduce maintenance costs.
This switch does not need direct contact with metal and therefore completely eliminated the security risks.
Touch sensitive switch circuit gives a sleeker view to the devices like UPSs, Mixer-grinder.
There are a number of ways to design the circuit by using different microcontrollers, ICs or even with some transistors. Throughout this discussion, we will discuss the design process for some of the simplest touch sensitive circuits that can be designed easily and are cost effective.
Touch-Sensitive Switch Circuit Using 555 Timer IC
To design this highly durable Touch sensitive switch circuit, we are using a 555 Timer IC as the main component. Here, the touch plate triggers the output of the 555 Timer IC, whenever sense a touch. Before getting started with the design process of this project, let's give you a quick overview of the 555 Timer IC.
555 Timer IC
The 555 Timer IC generally operates in three different modes depending upon configuration namely A-Stable, Mono-Stable and Bi-Stable modes. This IC is one of the most popular and widely used for providing time delay, as an oscillator or as a flip-flop element. This 8 pin IC is one of the most commonly used IC in electronic components. Go through the below table to understand the different pins and function of 555 Timer IC.
Related Project: PCB Design of LED Flasher Circuit using 555 Timer. Step by step
Gather the following components before starting the design process of the circuit.
Required Components:
555 Timer IC
Touch-Plate (conductive material/Metal)
Capacitors: 10 μF, 0.01 μF
Resistors: 100 K ohm, 470 ohm
Connecting wires
LED
Circuit Diagram for Touch Switch using 555 Timer
Here, 555 Timer IC is configured in Monostable mode. We can use two pieces of a conductor to make the touch plate, connected with the trigger pin of 555 Timer IC and ground respectively. Pin 5 of 555 timer IC is connected with a capacitor of 0.01 μf. Pin 3 is connected with resistor R2 and Pin 8 is connected with 6V power supply.
Working
Whenever we touch the conductive plates of the touch sensor, the 555 Timer is triggered. The output pin goes high turning ON the LED for some time. You can also connect a buzzer in place of the LED. The pulse duration generated at the output pin entirely depends on the timing resistor and capacitor of the circuit connected at pins 6 and 7 of the 555 Timer IC. That means you can change the duty cycle of the output pulse by changing the value of capacitor C1. The disadvantage of the circuit is that it consumes more power
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