How to connect a relay

Discussion in 'The Projects Forum' started by Shubam Agarwal, Oct 1, 2015.

  1. Shubam Agarwal

    Thread Starter New Member

    Oct 1, 2015
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  2. MikeML

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    Oct 2, 2009
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    Are you looking for a critique?
     
  3. Shubam Agarwal

    Thread Starter New Member

    Oct 1, 2015
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    I am not able to understand where to connect switch in relay. I.e to which terminal of relay
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    What are you trying to do? Be as specific as possible.

    The circuit you linked to was created by a total newbie; if you tell us what you are trying to do, we can likely come up with something much simpler...
     
  5. Shubam Agarwal

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    Oct 1, 2015
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    The concept is when I push the button then relay should be energised and even when I release push button it should glow led for few seconds depending on rc time constant
     
  6. AnalogKid

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    Aug 1, 2013
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    That is not your fault. This is one of the worst project descriptions I've ever seen. There are ten statements under "Circuit Operation", and eight of them are wrong. The schematic has critical errors, missing parts, and just generally makes no sense. There are dozens of people on this forum who will gladly help you design a better circuit. It will take less time than explaining all of the things wrong with the one you have.

    SO - what is it you want a circuit to do?

    ak
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I have no idea why they used a relay to switch that simple circuit?
    Why the P.B. was not used directly is a mystery!
    Appears a very poor design to achieve what they say.
    Max.
     
  8. Shubam Agarwal

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    Oct 1, 2015
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    I want to design a circuit which works on that concept...
     
  9. KMoffett

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    Dec 19, 2007
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    Do you want to design a circuit...or...do you want a circuit designed to do your concept?
    Battery + capacitor + 3 resistors + PB switch + LED + N-channel MOSFET. Circuit will have the LED fade out, or add a relay for sharp cutoff.

    Ken
     
  10. Shubam Agarwal

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    Oct 1, 2015
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    I want a ckt to work for
     
  11. ErnieM

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    Apr 24, 2011
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    Unfortunately there is no "concept" to follow here as the circuit cannot work, period. Even assuming the box labeled "push button" has a power source to turn on the relay the lamp will just turn on and off with the same push button, there is no delay.

    A simpler circuit to do the very same action is just the 9V battery, the push button, and the lamp. The rest is just junk that has no function.

    So, we ask again: what do you want the circuit to do? Is that turn on with the button, then turn off after some delay?

    The more detail you tell us the better we can assist you.
     
  12. Shubam Agarwal

    Thread Starter New Member

    Oct 1, 2015
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    Ya my concept us to turn on with push button and off after some delay after I release the push button
     
  13. KMoffett

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    Monostable-Relay BS108G 2.gif
    The time-off delay is set by R1 and C1.

    Ken
     
  14. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    What is the power source for your light?
    What is the power source for your timer?
    What light or how much light so you want to control. Ken's circuits show a single LED, but with the relay you can control a larger light source.

    ak
     
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