I have 5 LEDs in an array, which I need that when I press the power button, they turn on in sequence: the first one turns on and stays on, then the 2nd led turns on and the 2nd one stays on and so on with the third led until the 5th one. Once the 5th one turns on, they must stay on until I press the off button. The cycle is repeated when the circuit is turned on again.
I have done some research, and they all use 555's to do this, but it restarts the cycle automatically.
I have also thought about doing it with cascaded transistors, so that when I turn on the first one, it lets the power go to the second one. And the time delay I would get with a capacitor. But the problem is that I don't know how to calculate the transistors I need.
Context: 5 IR LEDs of 1.45 V and 50 mA. 1 battery of 1.5 V and 3 A. On/off button.