You didn't attach a schematic so I don't know how you connected the transistor.
Here, I just made a diagram of what is on my breadboard
I tried to attach it.
Doing this, I realised i haven´t made the connection between pin 4 of the 555 ic and the supply line, and though, it works.
(the 555 is very forgiving, I must say)
If you are as kind as to look at it and tell me if it´s okay ?
I still have to find a transistor for the leds i will connect between pin 3 and 1 of the 555 ic. I´m thinking of testing the tip31c.
Changing the single leds for the bulbs out of the 4017, I made a change because before, the positive lead of the led was connected to the ic and the negative lead to ground through a 330 ohm resistor.
(I painfully gropple my way in this new world of electronics, and here in Costa Rica, there is no way to have any help from the vendors in electronics stores)
If you overload the wall-wart (of course its max allowed current will be marked on it) then it will get hot and might catch on fire or burn out. Its voltage drops low when it is overloaded.
I looked at my wall-wart and it reads "ac-dc adaptor universal, current: 1000 mA MAX (made in China)" (why doesn´t it says 1A instead of 1000 mA, I can´t figure, I think it´s the same, no?)
So, do you think there is a risk I might provoke a fire?
Because, whan I tried lighting all the leds together of the first word of the display sign to test the soldering work, I powered it with that wall- wart and it worked just fine, but I rather have the word flashing for two reasons: it is more eye-catching, and the leds being in a foam board, i don´t want them to be lit continuously, for the risk of catching fire.
Thank you so much