traffic light seven segment circuit diagram

AnalogKid

Joined Aug 1, 2013
10,126
In your drawing, U1 is one of two things. It might be an integrated oscillator component, although those usually have a much higher output frequency. Or it might be separate circuit that produces a clock frequency as an output.

ak
 

AnalogKid

Joined Aug 1, 2013
10,126
It looks like U15 is the reference designator for the positive power supply voltage for the circuit, to tie three inputs to a logic 1. This connection disables the blanking features in the 7447.

With input D grounded, the chip will display only the symbols 0 through 7.

ak
 
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