A timer circuit is a flexible instrument used to regulate the timing of an event or process in a variety of electrical tasks.
The 555 timer IC, a popular integrated circuit for timing and oscillator applications, is utilized to create the Simple 60 Second Timer Circuit that is being presented here.
When a push button switch is pressed the circuit turns on an LED for around a minute.
Applications like time delayed indicators, hobby projects or easy electronic learning activities are perfect for this configuration.
Circuit Working:
Parts List:
| Component | Specification | Quantity |
|---|---|---|
| Resistor 1/4 Watt | 10Ω | 1 |
| Resistor 1/4 Watt | 10k | 1 |
| Preset | 1M | 1 |
| Capacitor | Electrolytic 1000μF | 1 |
| Timer IC | 555 | 1 |
| Tactile Push-Button Switch | 1 | |
| LED | Any 5mm, 20mA | 1 |
| Power Supply | 9V Battery | 1 |
The whole design of the Simple 60 Second Timer Circuit is shown in the above circuit diagram.
A push-button switch, a capacitor, resistors, a preset, an LED and the 555 IC in monostable mode make up the majority of its components.
In this circuit, the 555 IC functions in monostable mode.
The output pin 3 stays low in the monostable mode configuration until a signal at the trigger pin (pin 2) activates it.
The resistor VR1 + R2 and capacitor C1 combination govern how long the output stays high after being activated, after which it returns to its low state.
The primary operational steps are:
The circuit is in an Initial state with the output at pin 3 in a low condition prior to pressing the push-button switch.
The 555s pin 2 gets a low going pulse when push button is pushed setting off the timer.
The LED1 is thus illuminated when the output at pin 3 gets high.
The time constant T determines how long the high output condition lasts.
To obtain the required temporal length the total resistance may be changed by varying VR1.
VR1 is tuned to around 55kΩ for a one minute timer.
The LED is turned off, when the timing period is up the capacitor drains and the output at pin 3 goes back to its low state.
Formulas and Calculations:
Below are the formulas with calculations for Simple 60 Second Timer Circuit:
Timing Duration:
The duration of the high output state is determined by the time constant (T) given by:
T = 1.1 x R_total x C
where,
- R_total = R2 + VR1
- C = 1000μF
For 60 seconds timer:
R_total = 55kΩ
T = 1.1 x 55kΩ x 1000μF
T = 1.1 x 55000 x 0.001
T = 60.05 seconds (approximately 1 minute)
How to Build:
To build a Simple 60 Second Timer Circuit using IC 555 is mentioned below for connections:
- Gather all the components as mentioned in the above circuit diagram.
- Connect pin 1 of IC1 555 to GND.
- Connect pin 2 of IC1 555 to one terminal of push button and connect the other terminal of push button to GND.
- Connect resistor R2 between pin 2 of IC1 555 and positive of 9V DC.
- Connect pin 3 of IC1 555 to output through LED1 and resistor R1 to positive supply of 9V DC.
- Connect pin 4 and pin 8 of IC1 555 to positive supply of 9V DC.
- Connect pin 6 and pin 7 of IC1 555 to one terminal of preset VR1 and other terminal of VR1 to positive supply.
- Connect positive of capacitor C1 with pin 6 and 7 of IC1 555 and negative of capacitor C1 to GND.
Conclusion:
The simplicity of utilizing the 555 IC for time delay applications is illustrated by this Simple 60 Second Timer Circuit.
The time length may be changed to meet different needs by adjusting the resistance and capacitance values.
For those interested in electronics, this project is an excellent place to start learning the fundamentals of circuit building and the operation of timers.
This circuit might be a useful addition to your electronics toolset because of its simple design and dependable performance.