Delay Off Timer Circuit Diagram. 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. The time delay of the circuit can be increase or decrease by increasing or decreasing the value of 470uf capacitor.
In this post we discuss the making of simple delay timers using very ordinary components like transistors capacitors and diodes. It means for some time output pin 3 is high and for some time it remains low that will create a oscillating output. 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.
It also has a potentiometer to adjust the time delay where you can increase of decrease the time delay by just rotating the potentiometer.
You can use this circuit with any ac appliance. It also has a potentiometer to adjust the time delay where you can increase of decrease the time delay by just rotating the potentiometer. 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. You can use this circuit with any ac appliance.
