According to the fact that friends and colleagues took the trouble to do some answers with software analysis, we want this topic to end, why can't this module measure the switching frequency? It is correct to use the sound card as an example instead of the scope, but we want to proceed with this module... I will show you in a few more posts, even though I connect it directly from the base and gate transistor to the module, it does not show the frequency. We are here for the proverb that says that the engineer congregation will either build a way or find a way