Hello to all again. This time I'm facing the following problem:
I'm trying to make a simple square wave oscillator, preferably using CMOS gates. I need a 166 KHz stable (but not "super duper mega stable") square wave signal, preferably from 0 to 15V, but 0 to 5V would be fine.
I tested with a basic CD4011 (nand gate based oscillator) and with a basic SN74HC14 (inverter Schmitt trigger based oscillator) but the results are far from acceptable, I have a lot of jitter in the frequency in both cases. I attach four files:
SN74HC14 Oscillator - Basic Schmitt trigger based oscillator (the circuit from the video capture below)
CD4011 Oscillator - Basic NAND gate based oscillator
SN74HC14 Oscillator Video Cap 1/6 - Captures from a video of my oscilloscope screen where you can see the jitter
I suspect that the breadboard is not the problem because I'm working only at 166 KHz, but I really don't have idea what is happening. Searching in Internet found a lot of circuits but all of these are the same basic circuit and in any of these sites mention something about "jitter" or "frequency instability".
I am a bit disappointed with myself for not being able to function properly such a simple circuit, but always in electronics, things are more complicated than they seem at first glance. So, I really appreciate your help to solve this issue. Thanks a lot and best regards!
Mauro.