555 Timer Time Delay Circuit

555 Timer Time Delay Circuit


555 Timer Time Delay Circuit

LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes contact, the timer remains in that state until the start switch, S1, is pressed. When either switch is activated, LED1 (ready) and the time indicator, LED2, keep track of the situation.

555 Timer Time Delay Circuit diagram

PARTS LIST
R1 1KΩ
R2 10KΩ
R3 1KΩ
R4 1KΩ
VR1 1MΩ
C1 10µF
C2 0.01µF (103)
LED1 GREEN LED (FOR READY)
LED2 RED LED (FOR TIME)
IC1 NE555
SW1 PUSH TO ON SWITCH (FOR START)
SW2 PUSH TO ON SWITCH (FOR RESET)

THE TIME DELAY, T, in seconds is:

T=1.1×C1×(R1+VR1)

The resistances are in megohms (MΩ) and capacitances in microfarads (µF).

The sum of R1 and VR1 should not be less than 1000Ω nor higher than 20MΩ.

555 Timer IC pin configuration NE555 SA SE555 SE555C

555 Timer IC PIN Configuration

Pressing S1 starts the timing cycle. A low-going pulse, instead of S1 can also be used to initiate the timing cycle. The output terminal, pin 3, of 555, is normally low and switches high during the timing cycle. The output can either sink or source currents up to 200mA. Therefore, a load such as a relay coil can be connected between pin3 and VCC or between pin 3 and ground, depending on circuit requirements. When the relay is connected between pin 3 and ground, it is normally de-energized so it is energized only during the timing cycle. Connecting the relay to ground will save power and allow the IC to run cool.

555 Timer Time Delay Circuit ne555 timer time delay test circuit 555


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11 comments on “555 Timer Time Delay Circuit
  1. dhanavignesh p says:

    I want ON time delay circuit 1 min delay i want and also i want mobile jammar circuit with out affecting bluthoot signal plz help me

  2. Art Donkey says:

    Can you please explain what the right side of the schematic is doing? I am new to this and having difficulty deciphering the diagrams. Do the LEDs run one after the other in sequence? In what way are they connected to terminal 3 and 4 of the 555 IC? If mounting these on a breadboard, do the LEDs bridge over the gap between positive and negative side?

  3. MISTERFET says:

    thank u so much..keep on sharing guys..GOD BLESSED YOU ALL..

  4. Nils says:

    Thank you so much!

    Really worked and was perfect for the project I was doing – Turning a LED backlight on for a couple of seconds on button press.

    Thanks again!

  5. Ilda Barthell says:

    I saw this really fantastic post today.Your blog post is very cogent and makes a number of great points.

  6. darts says:

    Awesome blog , thanks for the post!

  7. Thanks for the great post.

  8. Kaleemullah says:

    realy its work and thax for share i think that you have to post these kind of knowledge good keep it up http://www.electronicecircuits.com

  9. balajikumar says:

    any project display circuits we want them

  10. Terrific work! This is the type of information that should be shared around the web. Shame on the search engines for not positioning this post higher!

    • UnholyAngel98 says:

      thank you dude!!! you did an awesome job! The Best of the simplest circuits that i ever seen. . Easy to understand and explain. . .

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