I have been following Ben Eater on YouTube with his 8-Bit computer build https://www.youtube.com/user/eaterbc
and the first stage of the build involves using three 555 timer IC's for the clock. The first is in astable mode the second in monostable and third in bistable. The third 555 is used to select between the first two stages. Each 555 has a LED at the output in order to show that it is functioning. As soon as I place a LED on pin 3 of any of the 555's i get 'CANNOT FIND SOLUTION'. I have tried different timings etc but still get the same result. I would like to have the LED's in as they are indicators for what mode the clock is in. Any help much appreciatted.
