Kliche Mini oscillation

[flippy69]

Hello, this is my first time doing a pedal pcb version of this pedal. I have built a few Klone’s before. I also know that this design oscillates when knobs are all the way up however, in this case the oscillation starts the minute clicked on and continues AFTER it is switched off. You can slow it down by turning knobs down but it never goes away. I took the entire pedal out of enclosure, re flowed some questionable joints and out back together. I also switched out the 1044 with no change. Please help.

 

[music6000]

Here are pix of two TC1044S charge pumps.
The one on the left was purchased from Small Bear in Sept 2019. My confidence level is 90% that this part is legit. Small Bear is not a factory authorized distributor, but has a history of selling legit parts.
The one on the right was purchased from Mouser in July 2019. My confidence level is 99% that this part is legit. Mouser is a factory authorized distributor.
View attachment 9093
Note that the font, Microchip logo and positioning on the face of the part is consistent. The differences in the package molding is of minor concern. The same factory will have a large number of package molding machines and they may not all be identical. The finish and color of the packages are consistent.

Now compare these with yours. Printing is consistent, but again, the package molding is different. I'd say yours is probably legit. The one thing we can't tell from these pix is whether any of them are testing rejects.
View attachment 9092

At this point, I'm not convinced that your squeal problem is not caused by the charge pump. We should be turning over other rocks looking for the cause.

Your Chip has the Standard Number 1 Pin Dot missing that are shown in Chucks chip, I think Duds!!!

 

[music6000]

Problem solved! I just got the chip from Digikey and this Kliche sounds like a klone. Tons of volume and headroom, super quiet, no trace of oscillation. I notice that the bad chips had no little indentation on the top left. Here is the beautiful and perfectly working chip.

While I was typing, Your message came in. That's why I only use 7660SCPAZ !!!

 

[flippy69]

So now I have another project that I almost trashed because I couldn’t figure out the problem, now I know. I bet I can get that other project working. Wow, lesson learned; never get ic’s from eBay.