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Problem with LM331 voltage/frequency converter in Proteus simulation

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mandy222

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Hi, this is for a college project, a thermometer, the schematic is below. The circuit works perfectly fine in real life, but I have some problems with simulation.
View attachment SCHEMATIC.png SCREENCAP.png
Adjusting RP2, I should be able to get 4kHz output with 1V input, but the output frequency is way too high. Even with pin 2 straight to the ground I still get about 60kHz output, as shown above, which doesn't make any sense. Below is what it looks like in real life when it's working properly.
FILE9.png
 

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