A delay timer can be easily implemented using a 555 timer integrated circuit.
In the monostable configuration, the 555 timer can be used to create a delay timer. You would connect the external components such as resistors and capacitors to set the desired delay time.
For instance, to achieve a delay of a few seconds, you might use a specific combination of resistor values and capacitor values. The charging and discharging of the capacitor through the resistor determines the time delay.
When a trigger signal is applied to the trigger input (pin 2) of the 555 timer, it starts the timing process. After the set delay time has elapsed, the output (pin 3) changes state.
This type of delay timer is commonly used in various applications like delay circuits for power-on sequences, time-delay relays, and automatic control systems.
For example, in a security light system, a 555-based delay timer could be used to keep the lights on for a certain period after motion is detected.
In conclusion, the 555 timer is a versatile component for creating simple and effective delay timers.