Hi, 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 remove the 555 square wave circuit.
The circuit is supposed to count up until the green wave form reaches the red and then it resets and starts again.
Circuit with the square wave generator in the bottom left hand corner
output when the 555 timer is disconnected from the circuit but the 5V source is connected
output when the 555 timer is connected
The correct waveform and what I am trying to achieve. My multsim file is here
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 remove the 555 square wave circuit.
The circuit is supposed to count up until the green wave form reaches the red and then it resets and starts again.
Circuit with the square wave generator in the bottom left hand corner
output when the 555 timer is connected
The correct waveform and what I am trying to achieve. My multsim file is here