Astable/Monostable oscillator using 555 IC


Posted on Oct 13, 2012

The 555 is a highly stable device for generating accurate time delays or oscillation. Aditional terminals are provided for triggering or resetting if desired. In the time delay (monostable) modeof operation the time is precisely controlled by one extrernal resistor and one capacitor. For stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor.



Astable/Monostable oscillator using  555 IC - image 1
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The circuit may be triggered and reset on falling waveforms and the output structure can source or sink up to 200mA or dive TTL directly. This IC may also be correctly supplied marked as MC1455PI. Supply decoupling must be provided close to the IC to coun




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