Skip to content
Electronic Circuits

DIY Hobby projects, diagram, schematic

Electronic Circuits

DIY Hobby projects, diagram, schematic

555 Timer Time Delay Circuit

electronicecircuits, May 22, 2010August 17, 2023
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
R11KΩ
R210KΩ
R31KΩ
R41KΩ
VR11MΩ
C110µF
C20.01µF (103)
LED1GREEN LED (FOR READY)
LED2RED LED (FOR TIME)
IC1NE555
SW1PUSH TO ON SWITCH (FOR START)
SW2PUSH 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 Circuitne555 timer time delay test circuit 555

Please send your ideas, which are very important for our success…

Electronic Circuits Timer Circuits

Post navigation

Previous post
Next post

Comments (14)

  1. school grants says:
    July 8, 2010 at 8:49 am

    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!

    Reply
    1. UnholyAngel98 says:
      October 16, 2013 at 11:01 am

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

      Reply
  2. balajikumar says:
    September 22, 2010 at 8:26 pm

    any project display circuits we want them

    Reply
  3. Kaleemullah says:
    September 29, 2010 at 9:17 pm

    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

    Reply
  4. James M Despain says:
    December 30, 2010 at 7:43 am

    Thanks for the great post.

    Reply
  5. darts says:
    January 13, 2011 at 9:01 pm

    Awesome blog , thanks for the post!

    Reply
  6. Ilda Barthell says:
    May 19, 2011 at 5:57 am

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

    Reply
  7. Nils says:
    June 25, 2011 at 3:16 pm

    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!

    Reply
  8. MISTERFET says:
    February 15, 2012 at 7:04 pm

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

    Reply
  9. Art Donkey says:
    March 20, 2012 at 12:13 pm

    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?

    Reply
    1. MichaelR5 says:
      July 12, 2015 at 1:31 am

      Note the path from Voltage in (+5 to +12v) goes through $3, then to both pin 4 and the anode (+) of LED1, then pin 3 connects between the two LEDs, and LED2 through R4 to ground. What happens is when pin 3 is high, the voltage across LED1 drops to minimal and LED1 is off, but the voltage across LED2 will be high, and it will therefore turn on. When pin 3 goes low, the opposite is true, so they switch which is illuminated.

      Reply
  10. dhanavignesh p says:
    November 29, 2013 at 9:58 am

    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

    Reply
  11. sado says:
    October 8, 2014 at 12:26 pm

    i need best electronics technology with their components

    Reply
  12. Fazlul says:
    January 10, 2015 at 7:10 pm

    I like this site.

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

  • Diagrams
  • Privacy Policy
  • Software
  • Contact

Recent Posts

  • LM317 CONSTANT CURRENT CALCULATOR
  • 5V buck converter – LM2576 simple DIY project
  • ICL7107 PANEL METER
  • Precision 1Hz clock generator circuit
  • Toggle to Momentary Switch Using 555 Monostable

Categories

  • Circuit Tutorials
  • Electronic Circuits
  • Electronic Software

AC Projects Alarm Circuits Amplifier Circuits Amplifiers Antenna Circuits Battery Charger Calculator software Circuit Designer Control Circuits Converter circuits Crossover Circuits Data Sheets Digital Circuits Electronic Switch Flasher Circuits Game Circuits IC Programmer IC Programming Indicator Circuits LED Circuits Light Circuits Logic Circuits Measuring Circuits Meter Circuits Microchip Motor Circuits Music Circuits Oscillator Circuits PCB Designer PIC Power Amplifier Power Guard Power Supply PreAmplifier Circuits Radio Circuits Regulator Circuits Regulator Diagrams Regulator Schematics RF Schematics Sensor Circuits Tester Circuits Timer Circuits Transmitter Circuits Tutorials Vacuum Tube

©2025 Electronic Circuits | WordPress Theme by SuperbThemes