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You my friend are a genius!

So cool! Great job!!

Thanks, friends! Lol.

At last someone do it right without using 123.4382.12 sources lol

Thanks, Secuture! Lol. True!

Yeah that's pretty cool but isn't it kinda cheating with that battery supplying continuous voltage to just one of the segments? I just thought you would have made it happen with logic alone. There's plenty of workspace left..

No, it's pretty common practice to have any segments that are common to all the numbers that are being displayed to be lit steadily. It's actually a pretty clever trick. Logic gates are not meant to drive any serious current, but in a case like this (using an actual 7 segment display), if you could powered the common segments directly from Vcc, then you could drive the other segments straight from the logic gates. I don't suggest it. Transistors are cheap, and they're a much better way to go about it. That way, the logic gates only need to push about 1mA to the base of a resistor. But I have done it, and it worked just fine. Again, I don't suggest it since I think most 74XX logic has a limit of like 10mA, or something ridiculously low like that. I think I had mine pushing about 15mA to the seven segment. Would it have lasted long? I don't really know. Did it work long enough for me to play around? You bet.

Or use classic TTL chips without mosfet technology like in hc or ls and other similar series. As i remeber those have much greaternoutput currents and their power supplies were massive and frequently deliver few amps when plenty of them were used.

The last time I looked at a data sheet for 74LSxx stuff wasn't too long ago, for an SN74LS10N (a JK flip flop made by Texas instruments), the ratings were like -0.4mA to 16mA. Both the CMOS and bipolar (BiCMOS) specs were very similar. Now, if you're referring to the stuff that was actually real TTL (the stuff they're still calling TTL nowadays is usually BiCMOS), that may have been different.

A 7476 JK that isn't HC or LS looks like it isn't capable of any more than that, either. Can you even get 74-series in true TTL anymore?