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This is a pulse generator circuits or standard Astable Multivibrator oscillator or free running circuit using IC555 timer,NE555,LM555. We use it for digital Logic circuits. IC-555 is popular easy to use small size with 8 pins. It is combining analog and digital chip. Basic using it need the voltage supply 5V to 15V, Maximum supply voltage 16v – 18v, Current consumption about 10mA, Maximum Output Current is 200mA.

Maximum frequency output is 500kHz. There are many ways to use the IC555. We can use them in three different types of oscillators: (1)Astable Multivibrator oscillator If frequencies more than 1 cycle per second, it is an oscillator (pulse generator or square wave oscillator). But frequencies lower than 1 cycle per second it is TIME DELAY. (2) Monostable (ONE SHOT) changes state only once per trigger pulse (3) Voltage Controlled Oscillator (VCO) Now we will learn about pulse generator with IC-555 below basic circuit.

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