555 Astable Multivibrator
Build a simple oscillator circuit using the popular 555 timer IC
Oscillator
Circuit Description
The 555 timer in astable mode creates a continuous oscillating output. The frequency is determined by the values of R1, R2, and C1.
Key Features:
- Adjustable frequency output
- 50% duty cycle possible with additional diode
- LED visual indicator
- Simple and reliable design
Required Components
Components needed to build this circuit
NE555 Timer IC1x
Resistor R110kΩ
Resistor R247kΩ
Capacitor C110µF
LED5mm Red
Resistor R3330Ω
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Circuit Analysis
Frequency Calculation
f = 1.44 / ((R1 + 2×R2) × C1)
With R1=10kΩ, R2=47kΩ, C1=10µF: f ≈ 1.4 Hz
Duty Cycle
Duty Cycle = (R1 + R2) / (R1 + 2×R2)
With current values: ~55%