demultiplexer

crutschow

Joined Mar 14, 2008
27,188
"Doesn't work" tells us little about the problem.
Is this strictly a simulation?
Can you be more specific about how it's not working?
 

crutschow

Joined Mar 14, 2008
27,188
You appear to be having convergence problems, which can come and go with just a slight change in the circuit.

Try the simulation with the .uic Spice command to "use initial conditions" which skips the initial DC operating point solution, and often solves the problem.

Do you know how to enter Spice commands in your simulator?
 

MisterBill2

Joined Jan 23, 2018
8,740
The circuit is OK, but not a very efficient use of components. It can only flash one color at a time, you could do that with a single pole 4 position switch.
 

DickCappels

Joined Aug 21, 2008
7,426
Did you remember to put a logic low on the Not-G pin (Enable pin), pin 1 on the package I am looking at?

CMOS inputs left floating in real life produce unpredictable results.
 
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