Delay Off Timer Circuit Diagram

Time period can be calculated using formula t r1 r2 c1 seconds when pot is maximum r is 120k 1 1m 1 2m approximately and c1 470uf.
Delay off timer circuit diagram. Video on long duration timer circuit diagram. We can use the different timer circuits of a different time delay to operate an alarm a device motors etc. We will be discussing all the four timer circuits 1min 5min 10 min and 15 min timer one by one throughout this article.
This time delay is set by the user. With the help of this circuit a user controlled delay to relay can be given. Here i present a very easy and simple circuit of on time delay timer circuit which is made using 2 transistors some resistors and a capacitor.
The above time delay is applied to the clock input pin 10 of the second cmos ic 4040 which is a 12 stage binary counter. At a certain time interval. December 26 2017 at 3 16 am.
When switch s1 is pressed then output will give high signal at pin 3 and transistor is on therefore the connected load with relay is also switched on. 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. Timer circuit for automatic switch off any appliance after a fix time duration.
The timer circuits are used to produce time delay intervals for triggering a load. This is done by using the relay in delay timer circuit. A friend of me wants 10 second delay timer circuit at can turn on fan 12v at use in an automobile.
The functioning can be understood with the following points. The main role in this circuit is played by the 555 timer ic. It also has a potentiometer to adjust the time delay where you can increase of decrease the time delay by just rotating the potentiometer.