Pulsating oscillator

[restorer-john]

I replied in a thread I was linking for you…

The issues with QA403 and 1.183 in terms of usage

Hi @Deadcap, OK, got it. There are two important considerations for each of these: First, FFTs can’t tell you much if the amplitude isn’t mostly constant during the acquisition. So, we need to get to a steady state for a meaningful measurement. Second, in I think all the cases you mention, there is a time required to get to that steady state . And that time isn’t very long. In the case of an amp supply rail sagging, that is usually measured in 10’s of milliseconds (CEA-490 contemplates a 20mS…