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DIY Hobby projects, diagram, schematic

Timer With On-Off Delay

electronicecircuits, August 9, 2009August 20, 2023
timer with on off delay circuit using ne 555 project

555 Timer With On Off Delay Circuit

Here is a timer circuit using common IC 555. The circuit is designed to facilitate time adjustment of both charged and discharged states of the relay.

timer with on off delay circuit using ne 555

PARTS LIST
R11KΩ
R2470Ω
VR11MΩ
VR21MΩ
C1100µf 25V
C20.01µf
D1IN4001
D2IN4001
Q1SL 100
IC1NE 555
RL112V 400Ω

The circuit uses IC 555 in astable operation. Separate delays for charged and discharged states of the relay are achieved by using two diodes (D1 and D2) and two potentiometers VR1 and VR2 provide control over the ‘on’ and ‘off’ stages of the relay, respectively.

The circuit with given values of VR1, VR2 and C1 provides time periods that are adjustable between a fraction of a second to about one-and-a-half minute approximately.

IC 555 used should be in good condition (preferably a new piece); old ICs can sometimes give wrong results. And capacitor C1 should be of a good make, such as ‘Keltron’ ,’Uptron’ , ‘philips’.

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

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Comments (7)

  1. Prem says:
    January 3, 2011 at 11:57 pm

    Can we use 12v instead of 15?

    Reply
    1. AsmVax says:
      January 20, 2015 at 9:10 pm

      Of course you can.

      Reply
  2. syed.s says:
    February 28, 2013 at 6:24 pm

    this circuit i will operate 24 volt relay,what can i do?

    Reply
  3. Bhupendra Singh Rathore says:
    June 16, 2015 at 2:22 pm

    Hi,
    I made the timer circuit but the relay is not operating as the coil voltage is low it’s 2.8 volts. Please suggest what can I do to rectify it.

    Reply
    1. admin says:
      June 18, 2015 at 5:56 am

      check transistor and please use diode (like 1N4001) parallel with the relay. (Diode cathode to positive side , flyback diode – for protection)

      Reply
  4. kiran reddy says:
    June 19, 2015 at 5:44 pm

    this circuit works perfectly.
    thanks.

    Reply
  5. sujatna Lokananta says:
    July 21, 2015 at 6:39 pm

    I need the delay off timer after the power on.
    It means that whenever the power source connected, the relay is automatic energize within certain period and then back to dis energize.

    So delay off timer is just work one time only when after the power source is connected to the circuit.

    please your advise me the circuit diagram.

    Thank you for your assistance.

    Reply

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