Circuit assistance, pleeeeze.

Thread Starter


Joined Feb 25, 2008
Can I modify the roulette wheel circuit to variably select 14 or 18 LEDs? I have successfully built a 10 LED randon selection curcuit using the 4093 and 4017 ICs but I am not sure with the 10 output pins of the IC that I can use this circuit. Thanks in advance.


Joined Jul 17, 2007
Unfortunately, the 4020 does not output Q1 nor Q2.

One can get 17 discrete states by cascading two 4017's using an AND gate (or two NANDS in series) - but for 18 states, it will require yet another gate and more logic.