Irregular Flasher

Posted on Feb 4, 2014

Two multivibrators with different frequencies can be built using the NAND gates of a 4011 IC. If the output of IC1. B is positive with respect to IC1. C, LED D1 is on. As the levels of IC1. A and IC1. D are exactly opposite, D2 is always on when D1 is off, and the other way around. The two oscillators have different frequencies, which are determined by the values

Irregular Flasher
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of R2/C2 and R5/C5 respectively according to the formula f0 = 1 G· (1. 4 RC) With the given component values, the frequencies are 2. 2 Hz and 7. 2 Hz. Low-current LEDs should be used, since the CMOS IC cannot sink or source sufficient current for normal` LEDs. The values of series resistors R3 and R6 are suitable for a supply voltage of 12 V, in which case the current consumption of the circuit is around 5 mA. However, in principle the 4011 can be operated over a supply voltage range of 5 15 V. Higher currents can be provided by the HC family (supply voltage 3 6 V) or the HCT family (5 V). Incidentally, the part number of the quad gate IC in the HC family is HC7400.

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