SOLVED Caesar choruses high noise floor when engaged

[andrewcx13]

Separating my other post into smaller sub posts per request.

So I have two Caesar choruses that I am building. Currently I have them both where the chorus effect is (finally) working, but the noise floor when the effect is engaged is massive and makes this currently unusable in any practical setting. I've tweaked the trim pot a ton, and found the very very small sweet spot where it is close to usable, but alas the noise floor is quite high.

I'm at a loss, at this point. I have a feeling it's probably some monday morning detail that I'm just not seeing.

Pictures:

File_009.jpeg

drive.google.com

File_008.jpeg

drive.google.com

File_000.jpeg

drive.google.com

File_001.jpeg

drive.google.com

 

[andrewcx13]

Anyone have any ideas on this? voltages I can check? I've got them both to work to the same level of high noise floor

 

[music6000]

Have you mounted these in the enclosure with Input & Ouput jacks grounded to the case as it will be Noisy out of the enclosure!

 

[Paradox916]

Did you sub any parts? ICs? Transistors? It probably isn’t the cause, maybe the ceramic caps...(not the MLCCs) I guess those have a tendency to be noisy I have read, but have no real experience with caps that aren’t ether box film or MLCC

 

[andrewcx13]

solved this today.
My own stupidity.
Borrowed my bassists power adapter, thinking it was a normal 1 spot 9v. It was the power supply for his MXR brick that is of course 18v.

Lesson learned, Caesar can not take 18v operation.