@Ian I made a Pierce oscillator, the bottom block represents a crystal. Give me an example with a pierce oscillator with a logic block.

 

@Ian I made a Pierce oscillator, the bottom block represents a crystal. Give me an example with a pierce oscillator with a logic block.

https://en.wikipedia.org/wiki/Pierce_oscillator
R1 is generally 10M and the two capacitors are twice the crystal’s recommended load capacitance. (The crystal sees them as being in series).

 

Will the output waveform always be a sine wave or not?

 

Generally a fairly distorted sine wave from the first stage and a squarewave from the second (Buffer).

 

I might perhaps have mentioned that back in post #2. I can’t see a good reason for making a Colpitts oscillator with a transistor then using logic gates to make a square-wave when I could make a Pierce oscillator with one of the logic gates,

Both responses have merit. The answer to a specific question, and the broader question on the efficacy of the original concept. I'll take your word on the latter.

 

I have passed the first output from the inverter of the 74hc14 (distorted square wave) into another inverter inverter (the 74hc14 has six) but the answer is always the same, it has the same overshoot

 

hello there again!
Could you possibly take a photo of your test setup please.
I believe your driver is too strong.
Underdamping will cause a system to overshoot and oscillate like this.


Your scope and probes can introduce all kinds of distortion. Your scope should have a square wave test output. When you touch that with your probe, what picture do you get? Your probe should have a compensation adjust, you can set that to show minimal artifacts.

 

tomorrow I'll go to work and send everything