This circuit allows the use of two triggers (inverters or NAND gates connected in this way) to activate two LEDs that flash alternately. In this way, with the need to have an indicator on a TTL circuit, a dynamic effect can be easily achieved. For the diagram, the integrated is 7414 and the power must be supplied with 5 V. The positive is pin 14 of the integrated and the negative is pin 7. The capacitor can have values in the range of 10 uF to 1 000 uF according to the frequency desired for blinking.
