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This simulation demonstrates a 555 timer-based oscillator circuit operating in astable mode, generating a continuous square wave output. The circuit uses two resistors (1 kΩ and 2.19 kΩ) and a 1 µF capacitor to determine the oscillation frequency. The waveforms show the capacitor charging and discharging between 1/3 Vcc and 2/3 Vcc, which controls the 555 timer’s threshold and trigger pins. The output alternates between high and low states, producing a stable waveform at about 255 Hz, as shown i