NOT gate ring oscillator circuit with RC-EEWORLD

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NOT gate ring oscillator experimental circuit with RC

The figure shows the experimental circuit of the NOT gate ring self-excited multivibrator with RC delay circuit. The oscillation circuit is composed of NOT gates IC1, IC2, IC3 and timing circuit components RP, C, etc. IC3 outputs a rectangular wave signal. R1 is a protective resistor to prevent the IC3 gate circuit from being damaged when the timing capacitor C is reversely discharged. NOT gate IC4 makes the oscillator output a rectangular wave with a better waveform.

Oscillation frequency estimation f≈1/2.3RC T≈2.3RC

The resistance value of the timing resistor is selected in the range of 100-1000Ω, and the value range of the timing capacitor C is relatively large, ranging from hundreds of pF to hundreds of microfarads, which can make the oscillation frequency range from several megahertz to several hertz. Replacing the timing resistor with a potentiometer (1.5kΩ) can continuously adjust the oscillation frequency and has a larger coverage rate. The chips used are 74LS04 .

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