Control Pin: The control pin is connected from the negative input pin of comparator one. This pin is connected to VCC for the flip-flop to stop from hard resetting. Reset pin is directly connected to MR (Master Reset) of the flip-flop. Reset: There is a flip-flop in the timer chip. This is output pin where Load is connected. OUTPUT: This pin also has no special function. If this pin is connected to ground (or less than Vcc/3), the output will be always high.

With the comparator two output high we get high voltage at the timer output. The comparator two output is connected to SET pin of flip-flop. TRIGGER: Trigger pin is dragged from the negative input of comparator two. Ground: This pin should be connected to ground. Below you can find the pin diagram of 555 timer IC along with the details of each pin. Required Components:īefore going into detail of Time Delay Circuit, first we need to learn about 555 Timer IC first. Also check our 1 minute timer circuit using 555. A 5v voltage regulator is used for giving 5v regular supply to the circuit. Here we have used 9 V battery and 5V optional relay for switching the AC load.

It also has a potentiometer to adjust the time delay, where you can increase of decrease the time delay by just rotating the potentiometer. This circuit consists of 2 switches one for start the delay time and other for reset. In this project we are going to design a Simple Time Delay Circuit Using 555 Timer IC.

Set 1 minute timer