IF you want the small circuit two LED Flasher, I show this circuit.
The important part of the circuit is IC 4011 again, I used gate of IC 4011 (see image).
IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 1Hz frequency.
Two LEDs are flasher to alternate.
To change value C1 and C2 for other flasher ratio.
Detail more, Please read in this image circuit.
See video to test this circuit on breadboard.
From circuit below it lower light LED I think this circuit better.
This simple circuit uses NAND Gates to alternately flash two led’s. The two 47uF capacitors determine the flash frequency. It is a good idea to use a decoupling capacitor across the power supply. I made this circuit using the components shown and it worked fine. The IC that I used is the 4011 Quad
2-input NAND Gate.
As video below we use LED super bright RED color:
Quote and Order boards in minutes on https://jlcpcb.com/quote