Introduction
The 555 timer IC is a versatile chip used for various timing applications. In this experiment, we'll explore the 555 timer in astable mode, where it functions as an oscillator generating a continuous square wave signal.
Objective
The goal of this experiment is to configure the 555 timer in astable mode and observe its output frequency based on the chosen resistor and capacitor values.
Components Needed
- 1 x 555 Timer IC
- Resistor R1: 1 kΩ
- Resistor R2: 10 kΩ
- Capacitor C1: 10 µF
- 1 x Breadboard
- Connecting Wires
- Power Supply (5V)
Circuit Diagram
Procedure
- Connect pin 1 (GND) of the 555 timer to the ground of the power supply.
- Connect pin 8 (VCC) to the positive voltage supply (5V).
- Place resistor R1 (1 kΩ) between pin 7 and VCC.
- Place resistor R2 (10 kΩ) between pin 7 and pin 6.
- Connect a capacitor (C1: 10 µF) between pin 6 and ground.
- Connect pin 3 (output) to an oscilloscope to observe the output waveform.
- Power on the circuit and measure the frequency of the square wave output.
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Results and Calculations
The output frequency (f) of the 555 timer in astable mode is given by the formula:
f = 1.44 / ((R1 + 2R2) * C1)
Substitute the values:
f = 1.44 / ((1 kΩ + 2 * 10 kΩ) * 10 µF)
f = 6.86 Hz
Observe the waveform on the oscilloscope and verify if the measured frequency matches the calculated value.
Conclusion
In this experiment, we successfully configured the 555 timer in astable mode. The generated square wave frequency matched the theoretical calculation, demonstrating how resistor and capacitor values affect the timer’s oscillation frequency.
