I have made a stable circuit using a 555 timer and added a switch on the reset pin parallel connected with an RC circuit. It works fine on multisim, But when I try it on the breadboard, the reset pin does not affect the circuit it continuously blinks even when I disconnect the reset pin. please guide me what to do?

 

The 555-timer RESET pin (pin-4) is connected to the wrong side of the switch.

 

Also the 1M resistor is much too large. Are you using a cmos 555 or a NE555?
The 555 circuit was drawn incorrectly, should look like this:

 

I have made a stable circuit using a 555 timer and added a switch on the reset pin parallel connected with an RC circuit. It works fine on multisim, But when I try it on the breadboard, the reset pin does not affect the circuit it continuously blinks even when I disconnect the reset pin. please guide me what to do?

 

Still wrong. See post #2

 

C2 = 10 μF
R5 = 220 kΩ

should give about 5 seconds run time before the 555-timer is RESET.

 

My LTspice sim below, requires 324K for a 5 second on-time with 10µF:
(E1 provides a high impedance, gain-of-one buffer to simulate the Reset input of a CMOS 555, since I don't have a working model for that).

 

I have made a stable circuit using a 555 timer and added a switch on the reset pin parallel connected with an RC circuit. It works fine on multisim, But when I try it on the breadboard, the reset pin does not affect the circuit it continuously blinks even when I disconnect the reset pin. please guide me what to do?
View attachment 326308

The 0 ohm resistor in fact is redundant. The “reset” pin should be pulled up to Vcc+ through a resistor (say 10k) to avoid mis-triggering during operation. Your reset switch should be wired in series with another resistor (say 2k) to GND. This will form a voltage divider to trigger the reset pin when the switch been operated.
Please refer to the V(reset) and I)reset) parameters in datasheet and adjust ratio of the two resistors so that the reset pin can be triggered correctly. Also note that the reset pin is “-ve active”.

 

The NE555 chips that I use are 4.5 Volts minimum supply voltage according to datasheet.

Maybe check minimum supply voltage for the exact chip that you use.

Hopefully you are using CMOS 555 as suggested by sghioto above.

 

Welcome to AAC, @fahadrafi.

Is this coursework? Is it an assignment?