Problem with the splitter kit

Hello to all,

I bought the splitter kit two weeks ago and assembled it last week-end. Everything went smoothly since the instructions are clear, the PCB is marked with all sorts of hint for placing the component at the right place and with correct polarity.

However, I have a problem. When I plug an instrument into the input of the splitter and an amp at any output and then power the pedal, it first starts working correctly : the sound is clear and the output level is ok. But after a few seconds, the sound starts being distorted and the input has to be of a quite high level if I want to get some (distorted sound) on the output. Things get worse and worse after a few more seconds and after some time there is no output at all. If I unplug the power and wait for a few minutes than replug, the pedal works again for a few seconds...

I've attached a few photos of both sides of the PCB. If any of you has an idea of what is going on...

I have checked all my solder work and it seems ok... Since the problem is dependent on time I was thinking about a capacitor related problem, but I don't see what I could have done wrong .

Thanks in advance for your help !

Thank you for your answer,
Here is the schematic of the kit : https://www.musikding.de/docs/musikding…itterschalt.pdf

and wiring guide : https://www.musikding.de/docs/musikding…plitterwire.pdf

There are no other instructions for building the kit other than the general ones.

I'll measure the voltage at each IC pin and post them here.

I've already checked the soldering point last week (and re-soldered most of them just to be sure). I also checked for example that all the point that should be connected to the ground are connected together.

I've measured the voltage of the TL072. It seems it does not get enough voltage on its V+ pin...

Pin 1 (output A) : 0,37V

Pin 2 (invert i/p/ A) : 0,37V

Pin 3 (non invert i/p A) : 0,5V which drops to 0 while measuring

Pin 4 (V-) : 0V

Pin 5 (non invert i/p B) : 0,5V which drops to 0 while measuring

Pin 6 (invert i/p/ B) : 0,37V

Pin 7 (Pin 1 (output B) : 0,37V

Pin 8 (V+) : 1,67V

Problem solved (and shame on me)

I had inverted my two red wires on the PCB (9V and LED power supply)