E-cig as a substitute of tobacco mainly reminds people of its potential benefits for health. Four ingredients contain in the e-liquid : propylene glycol, glycerin vegetable, nicotine and food grade essence. Nevertheless, smoke from cigarette contains carbon monoxide, tar, arsenic, ammonia, and many other cyanide and acetone.
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The transistor switch lines of the LEDs are turned on one after the other to display the input voltage for the rising columnar display. R2 adjusts the minimum range (0.1-0.5V) of 5 LEDs in 0.1V increments to the maximum range (1.0-10.0 V) in 1V increments. The input resistance of the circuit is greater than 100,000 ohms.