Relay Module Timer Adjustable Delay NE555 DC 12V

AED 9.45

Low stock


This NE555 Delay Monostable Switch Module is a high-performance timer switch module based on the NE555 IC. available switch trigger timing indication LEDs and power indicator LEDs Timing ranges from microseconds to many hours.


Package Includes:

1 x NE555 Delay Switch Module 12v



  • the Relay time delay and power supply are connected
  • the delay time is adjustable, (0 ~ 11 seconds)
  • Adding a resistor to the potentiometer can increase the delay time
  • You can add capacitor C1 which can increase latency time
  • with input power light, Relay and Power LED
  • can control the device with AC 220 v / 10 or below. (maximum control equipment 2200W)
  • stream with Relay protection
  • the delay time formula: T = 1.1 RC. For example: 100 of capacitance resistance 100 k T = 1.1 * 100000 * 0.0001 = 11 seconds


This NE555 Delay Monostable Switch Module is a high-performance timing IC-based timer switch module that is based on the NE555 IC the switch trigger timing indication LEDs and the power indicator LED available. microseconds to many hours of timing available can be applied to vehicle equipment so the delay prevents vehicle ignition as well as large sudden currents from burning electronics and components. the design based on a monostable generator uses the NE555 integrated circuit as its core. By adjusting the capacitance or the potentiometer, the delay period can be changed from 0 to 11 seconds. It can also manage equipment with less than 220V/10A.


Principle of Work:

Module outputs: normally open (NO) and the common terminal (COM) are disconnected, normally closed (NC) and the common terminal (COM) is connected. Providing a low pulse signal, touch trigger key, Relay, and indicator lights, the output of the state: normally open (NO) and common terminal (COM) connected, normally closed (NC), and common terminal (COM) disconnected. After 0-11 sec (this time can be adjusted to your needs), turn off the relay and return to the state before the trigger.
The length of time that can be adjusted with a potentiometer,

monostable 555 timer


When a negative ( 0V ) pulse is applied to the trigger input (pin 2) of the Monostable configured 555 Timer oscillator, the internal comparator, (comparator No1) detects this input and “sets” the state of the flip-flop, changing the output from a “LOW” state to a “HIGH” state. This action in turn turns “OFF” the discharge transistor connected to pin 7, thereby removing the short circuit across the external timing capacitor, C1.

This action allows the timing capacitor to start to charge up through resistor, R1 until the voltage across the capacitor reaches the threshold (pin 6) voltage of 2/3Vcc set up by the internal voltage divider network. At this point, the output of the comparator goes “HIGH” and “resets” the flip-flop back to its original state which in turn turns “ON” the transistor and discharges the capacitor to ground through pin 7. This causes the output to change its state back to the original stable “LOW” value awaiting another trigger pulse to start the timing process over again. Then as before, the Monostable Multivibrator has only “ONE” stable state.

The Monostable 555 Timer circuit triggers on a negative-going pulse applied to pin 2 and this trigger pulse must be much shorter than the output pulse width allowing time for the timing capacitor to charge and then discharge fully. Once triggered, the 555 Monostable will remain in this “HIGH” unstable output state until the time period set up by the R1 x C1 network has elapsed. The amount of time that the output voltage remains “HIGH” or at a logic “1” level, is given by the following time constant equation.

555 timer equation

Where, t is in seconds, R is in Ω and C in Farads.

PPinout of the Module:


  • Vehicle equipment - delay preventing car ignition,
  • Sensitive home appliances: prevention of high sudden currents to burn components and devices.


These are circuits for the module being used as a switch and with DC and AC applications.




This Module doesn't need a library to work.


Module is not MCU Based

Technical Details:

  • Input voltage: DC 12V
  • Dimension: 68mmX21mm
  • Application Voltage: AC 220 v
  • Max Relay Current:10A
  • Maximum Equipment Controlled Power:  2200W
  • Main Chip: NE555





This 555 timer-based works on 12v and can not work on a voltage lower than 12v so if you need another item workers to use a USB cable which gives 5v and to be able to use voltage till 30v you can check this item

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