Improve Your Door Bell Circuit with These Simple Tips

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Discussion Overview

The discussion revolves around modifying a doorbell circuit to introduce a delay before the buzzer sounds after the push button is activated. Participants explore potential solutions involving the NE555 timer IC, including its operation in monostable mode and the adjustment of resistor and capacitor values to achieve the desired timing.

Discussion Character

  • Technical explanation, Conceptual clarification, Homework-related, Exploratory

Main Points Raised

  • One participant describes a working doorbell circuit that buzzes immediately upon button press and seeks advice on implementing a delay of 2 to 3 seconds before the buzzer sounds.
  • Another participant suggests using the NE555 IC in monostable mode to achieve the timing delay, referencing a Wikipedia article for guidance.
  • A different participant questions whether adding a second NE555 IC could facilitate the delay before enabling the buzzer oscillator.
  • There is a discussion about the formula for timing with the NE555 IC, specifically the relationship between resistance, capacitance, and time delay.
  • Participants express uncertainty about the exact values needed for resistors and capacitors to achieve a 2-second delay.

Areas of Agreement / Disagreement

Participants generally agree on the use of the NE555 IC and its monostable mode for achieving the delay, but there is no consensus on the specific implementation details or the exact component values required.

Contextual Notes

Participants mention the need for specific resistor and capacitor values to achieve the desired timing, but there are no settled assumptions or calculations provided to clarify these dependencies.

Who May Find This Useful

Individuals interested in electronics, particularly those working with timer circuits or seeking to modify existing circuits for educational purposes.

Ali Inam
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Hi guys, today I made this simple form of door bell. It is working perfectly, there is a simple push button, which on pushing, enables the buzzer to buzz on sufficient voltage.

But, when I showed my circuit to my intructer, he asked me to modify it in such a way so that when I push the button, it should wait for 2 to 3 seconds before it buzzes.


Any idea how I may do it ? Any new IC to be implemented ? or should I change the values of the capacitors which I am using in my circuit ?

I changed the resistor values using the formula which is demostrated on the wikipedia portion of the 555 IC, but it was of no use.

Please help...


http://4.bp.blogspot.com/_RpOfkmvmO...h_jjP8N0/s400/simple+electronic+door+bell.JPG
 
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Ali Inam said:
Hi guys, today I made this simple form of door bell. It is working perfectly, there is a simple push button, which on pushing, enables the buzzer to buzz on sufficient voltage.

But, when I showed my circuit to my intructer, he asked me to modify it in such a way so that when I push the button, it should wait for 2 to 3 seconds before it buzzes.


Any idea how I may do it ? Any new IC to be implemented ? or should I change the values of the capacitors which I am using in my circuit ?

I changed the resistor values using the formula which is demostrated on the wikipedia portion of the 555 IC, but it was of no use.

Please help...


http://4.bp.blogspot.com/_RpOfkmvmO...h_jjP8N0/s400/simple+electronic+door+bell.JPG

This is for school, so we are not going to give you a solution. However, we can give you hints...

What other functions can a 555 IC perform, other than just oscillator? If you added a 2nd 555 IC, could you use it to make a delay before enabling the buzzer oscillator?
 
Essentially what he is asking you to do is operate the NE555 IC in what is called monostable mode - basically it only starts 'timing' when it gets a certain input signal. The wikipedia article is fairly helpful:

http://en.wikipedia.org/wiki/555_timer_IC#Monostable_mode

Basically, set your R and C to the correct time amount: 2 seconds is a long time and may require a pretty huge capacitor.
 
So you mean that I will have to use the formula which is available on wikipedia

t = RC ln (3) ??


and from this, I will try to get t=2 by changing the values of the resistors and the capacitors ?
 
And berkemen, you mean that if I connect another IC with my circuit then it will be able to develop a sort of delay in its functioning ?
 

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