SIMPLE RAMP GENERATOR CIRCUIT USING 555

The 555 astable multivibrator can be used as a free running ramp generator. when the frequency determining network Ra and Rb in the 555 astable multivibrator is replaced by a Current mirror.



simple ramp generator circuit


Figure shows the circuit diagram for free running ramp generator.



The current mirror starts charging capacitor C toward Vcc at a constant rate. When voltage across capacitor C equals 2/3 Vcc (Vcc-5V), comparator 1 turns transistor Q1 on, and C rapidly discharges through Q1. However, When the discharge voltage across C is approximately equal to 1/3 Vcc, comparator 2 switches the transistor Q1 off, and then capacitor C starts charging up again. Thus the charge-discharge cycle keeps repeating.

waveforms ramp generator


OUTPUT WAVE FORM-RAMP GENERATOR


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6 comments:

  1. i like it
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