Jedspeds boutique k clone issue

[Danielmarsh1992]

I recently ordered a DIY boutique K kit from Jedspeds and put it together according to the build guide and made sure the assembly was clean. Once the BK was fully assembled I hooked it up to test it and I noticed a strange overtone (a sort of strange clipping and unpleasant drive sound that was almost separate from the tone of the pedal). As I was working to a deadline instead of figuring out the problem there and then I just ordered a replacement kit. Once the second kit was put together I was experiencing the exact same problem. I'm thinking there must be a mistake on the build guide that I missed and maybe someone more experienced on here could help me troubleshoot this issue!

Build guide: https://docs.wixstatic.com/ugd/a9cab5_8c95d687618b47888ccd9d220de73eb1.pdf

Video of the overtone:
https://photos.app.goo.gl/PMyUZvCxcLV37CjV6

[willienillie]

I'm fairly sure that those TL072s are fake.  I mean not actually TI parts, though they may be some other working dual opamps and not related to your problem.  Since they're in sockets, easy to swap with known-good parts and check.  If you don't have any others to try, order some from a reputable supplier, not Ebay/China.

[Danielmarsh1992]

Thanks for the reply and advice! Do you have a website you could suggest to me with trusted and good quality parts?

[Kipper4]

Welcome aboard


Just because its not a TI chip doesnt mean its fake Willie.

Many other manufacturers make the popular TL072 spec chips.
I've never had "fake" TL072 and I've bought hundreds of them.

I also highly doubt Jeds would want to deal with the backlash and loss of reputation associated with incorperating bad chips into a kit style purchases.



Just so you are aware talk of Klons is not appropriate in this forum as i understand it.
by agreement with the site owners.
There are other banned subjects too, best go look at the rules and regs.

[Danielmarsh1992]

Hey thank you for your input in the thread! I wasn't to sure about the "fake" parts because I've had other kits from Jedspeds and never had any problems with those kits just this one. I had a look at the rules before posting and it said to avoid posting the schematic and to avoid calling it by its branded name. If I'm wrong I'm happy to remove the post as I dont want to upset anyone in this community!

[Kipper4]

Fair do's sounds like you're in compliance.
Carry on. I have no wish to be disruptive.
Hope you get it sorted.

The issue could be a layout issue
there are certain things like placing the input close by the output sometimes which might cause oscillation or other bleed issues.
Not saying that what it is, just saying.

[duck_arse]

also welcome, Danielmarsh1992.

wot you really need is for someone with charge pump IC experience to chime-in and advise on whether or not it is/might/could be pumped supply noise.

[willienillie]

Just because its not a TI chip doesnt mean its fake Willie.

Many other manufacturers make the popular TL072 spec chips.
I've never had "fake" TL072 and I've bought hundreds of them.

I also highly doubt Jeds would want to deal with the backlash and loss of reputation associated with incorperating bad chips into a kit style purchases.

Well I did a little bit of research before I replied, because the markings looked odd to me.  A quick google images search gave me this result from Amazon:



Notice it has the same date/lot/facility/whatever code as the ones in Randy Stan Daniel's picture.  This seems common practice with fake ICs, like the bazillion "JRC" 4558s with code 0058T.  And like I said, they may still be functioning opamps, and maybe even TL072s.  But if it's marked TI without being TI, I call that a fake.

I've never heard of Jedspeds, and have no idea what kind of reputation they may or may not be concerned with maintaining.

[Danielmarsh1992]

Thanks for looking in to this willienillie. I will definitely look in to replacing these chips if you think they're not 100% genuine. Also appreciate the southpark banter  . I would just like to state that I've never had a problem with any other jedspeds products and I'm sure this is an isolated case.

[idy]

Usually we start with voltages on the pins of the ICs. But any problem you have seems to subtle to a matter of misbiased opamps or the other usual bugs.

On the video I can't be sure if I hear anything strange. I would want to be sure I am hearing guitar into pedal into amp with nothing else even on the same power supply. I would want to hear chords and single notes with pedal bypassed and then both with gain at minimum and max. Even a scale would help the ear separate any overtone from the junk specific to, for example, the guitar having a fret buzz

[Danielmarsh1992]

idy I'll definitely check the voltage differences on the pins of the IC to see if there is any noticeable discrepancies.

It's very subtle (especially on the video) but it's most noticeable on the decay of single notes which would make it basically unusable for recording. I'll try and get a more in-depth video and do all the things you mentioned in your post to make the issue more obvious. It doesn't seem to be a problem with the guitar or power supply as I've tried a few different ones and have the same issue every time!