i'm making a digital clock. Right now the plan is to matrix them on a atmega328 using transistors. I figured i need a transistor on both sides or the current would be sinked/sourced by the atmega, which is not what i want.
I'd rather use the MAX7219 but i'm not sure if it's possible to use transistors, because i don't think the MAX7219 can handle the current.
I found the circuits here, i smushed them together, is this correct? Idk.
This is the led segment i'm using, there's four of them. So four 337 transistors, one for each digit. And seven 327 transistors, one for each segment. I will scan through the four digits and turn on the apropriate segment.
So yea, please let me know if this is totally wacky or something else.
So normally it goes something like this : The cathodes of the leds are controlled directly by the atmega, but results in the atmega supplying the current. So my reasoning would be to put a row of transistors there instead, would that be correct?