I have a pretty bizarre problem with Multisim. I have a larger circuit which works perfectly when the inbuilt square wave generator for Multsim is used. I wish to replace the square wave generator with my own.
I have a 555 square generator circuit which works perfectly when I test it by itself, the moment I recreate that circuit in the main circuit and connect it to a 5V source the output of the main circuit just stops after a few milliseconds. This only occurs when the square wave generator is connected to a source without even connecting it to the rest of the circuit, when I remove the 5V source the circuit simulates for a few seconds and then just stops the only way to get the correct waveform is to completely[![enter image description here]] remove the 555 square wave circuit.
When I do connect the 555 timer I get an incorrect output for a few milliseconds and the circuit stops anyway. I have no idea why the presence of the timer breaks the rest of the circuit and I was hoping someone could enlighten me on this.
The circuit is supposed to count up until the green wave form reaches the red and then it resets and starts again.