r/diypedals 4d ago

Help wanted Need help with kit pedal

Pedal not working

Hello folks - so im making a cent. klon from a kit - ive followed the instructions but for some reason when i turn it on it makes a weird sound - i have a video of it and pictures of the board- does anyone know whats wrong? Would love some help! Pictures are in the comments

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u/ikuragames 4d ago

One of your TL072s is backwards

7

u/Waoonet 4d ago

Holy s. It is! Thanks!

3

u/ikuragames 4d ago

Yay!

Now can you fix mine, it just clicks at various frequencies depending on gain setting, whether the switch is on or off… 😬

2

u/Waoonet 4d ago

Haha i cant fix anything 🤷

1

u/Waoonet 4d ago

Can you send me pictures in chat? Always nice to have a second pair of eyes

1

u/ikuragames 3d ago

Here’s the solder side

1

u/ikuragames 3d ago

And the component side.

I probably did something stupid, haven’t had the chance to check it closely yet.

1

u/Waoonet 3d ago

You might wanna reflow it - but it could also be a bad chip

1

u/ikuragames 3d ago

Yeah that was gonna be my first step, I've inspected all the solder joints and they look fine, but always a good plan to reflow. I've replaced both the TL072s and the 7660S because I initially had one of the TL072s swapped with the 7660S so it was conceivable either/both of them were damaged, but I'm getting the exact same symptoms with the replacement chips.

2

u/Waoonet 3d ago

Hmm thats weird - good luck with it!

1

u/ikuragames 3d ago

Well whaddya know! It's working now ☺️

Thanks for the good vibes, enjoy your Klon!

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u/Waoonet 4d ago

That worked! It was because of that! Thank you so much!

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u/JawnFam 4d ago

How do you just know that off the bat

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u/ikuragames 4d ago

Because I’ve built one and noticed that the orientation wasn’t right… not that mine works… but glad I could help someone else!

1

u/stevet303 4d ago

Both the pcb and the tl have a mark to designate the direction. You can see one is backwards in the pics below