Time Delay Relay Circuit Using 555

We can adjust the time of delay by changing the values of the resistor and capacitor used in the circuit.

Time delay relay circuit using 555. We have connected a switch at the input pin pin 2 of 555 timer ic so when the switch is pressed the ic will be triggered and it will provide the desired time. To prevent 555 timer from flyback current in the relay use a diode before the relay. With dr2 you can reset the assembly any time you desire. The time intervals can be used for keeping a relay controlled load on or activated for the desired amount of time and an automatic switch off once the delay period.

In the circuit diagram the ic works as a monostable multivibrator. T 1 1 r c where t is the time period in seconds and r c are the values of timing resistor and capacitor used. In this project we are going to design a simple time delay circuit using 555 timer ic this circuit consists of 2 switches one for start the delay time and other for reset. The output stays on for a few seconds and then turns off.

To set the time delay of our circuit we have used an electrolytic capacitor cx if you want a time delay of a few seconds to use 10µf for a delay of 2 minutes use 100µf and so on. To connect power to the 555 timer chip we connect about 5 15v to vcc pin 8 and we connect pin 1 to ground. In order to obtain time delay we are using 555 timer ic for this purpose. Time delay relay.

It also has a potentiometer to adjust the time delay where you can increase of decrease the time delay by just rotating the potentiometer. The time period of the delay timer circuit we made is equal to the time taken by the capacitor to charge from 0v to 2 3rd of the supply voltage and theoretically the value is equal to. This time delay relay circuit is built with ic ne se555 produced by intersil which contains a precision timer. Some 555 versions may get damaged because of this.

A delay before turn off circuit is a circuit that once you apply power to it turns on the output right away. The 555 timer delay before turn on circuit we will build is shown below. How to build a delay before turn off circuit with a 555 timer. We connect a 100μf capacitor to the positive voltage supply and then to pin 2.

The breadboard schematic of the above circuit is shown below. The circuits explained here are 10 best small timer circuits using the versatile chip ic 555 which generates predetermined time intervals in response to momentary input triggers. Stability to temperature variations is 0 005 o c. A time delay circuit can be useful for any circuit that needs a delay before output turns on.