submit this circuit which automatically makes a LED or small focus may increase or decrease light intensity by varying the voltage, this voltage variation is achieved through the use of LM741 operational amplifier is implemented as adder and as an investor, it is also used 74LS164 IC is an integrated data transforms serial to parallel form, which is enabling the different voltages to the adder, frequency or speed is decreased or increased the intensity of light depends on a LM555.
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