Each numeral needs to be decoded by a 4543 IC (or else 4511). This makes four ICs to drive 4 numerals.
Well, if I had to design a functional (as opposed to 'for display purposes only') I would use dedicated multiplexer devices such as the MAX7219 or MAX7221 which would drive 8 digits each so six would be needed for 12 x 4 digit displays and they could be driven by a single small microcontroller. I think I could do the whole thing in 8 ICs. The wiring is FAR simpler and fewer components are needed but you do have to write some software and if it was used as a real movie prop you would have to be careful of strobe effects between the multiplexing and camera shutter speed.Could these be the above quoted components??
But doesn't the number on the thumb wheel have to be decoded??
And to retain a number before moving on to another set of 4 Digit LEDs, I'll need the 4511 latch, right?
How do I wire all 12 4 Digit LEDs readouts into one thumbwheel switch?
I did the math, it's 260 wires!
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