Police strobe blinking circuit simulation | 3 Style 2 channel LED Flashing effect circuit Simulation

In this video i am showing the Simulation of 3 Mode LED Chaser, Blinker, Flasher circuit using the software.
First Mode- Police strobe/Police vehicle light
Second Mode- Alternatively ON-OFF blinking both group of LEDs
Third Mode- All ON and OFF together at a fixed timed duration.
You can modify or change this circuit with a different effect using circuit modification.
A Pushbutton Switch is used in this circuit to change the Mode of Flashing effect. This circuit operated without microcontroller but uses total 4 ICs.
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يعطيك العافية ممكن توضيح سبب اختار قيّم المقاومات على ال base of transistor وال NE555