Thanks for the images 1> L2 induct 470Uh that had to be 330Uh 2> D17 Missing 3>R 55 removed for testing 4>Q20 Missing 5>RC2 2k ok but why not buy SMD, you may damage the PCB like that just saying. 6> What happened to R8 and R18 ? Resistor out of stock or what? Going in a series may be a bad idea.
Besides from the above seems you put everything correct from what I could see.
Please send us FRONT and BACK photos just of the PCB without any Wires connected, also make sure that all components are clear. This will exclude the possibility of a wrong soldered component.
I guess he means to check the chips that amplify the signal. By Check, I guess he means Remove and replace unless you can replicate signals using good PCB with an oscilloscope and compare.
I agree that you learn by mistakes but I guess you exceed the limits of your luck.
You have damaged the PCB, burnt components maybe its time to restart again.
In this case, both look good but it is hard to say if it is counterfeit or really made in a 3M factory. Why a company like 3M make it hard for us to buy goes beyond my knowledge.
Suggestion for anyone applying tape to any surface always make sure to heat it up first it will create the best bond ever. You will thank me after if you need to remove it.
Re China they do have 3M factory but even the original does not match the genuine product since they have there own standards which does not match our EU standards.
For China CE = CHINA EXPORT For Europe CE = Quality having said that they might be the same product if really comes from 3M CHINA Factory.
Because I didn't reply to you in time, had these unintelligible comments, right? You have all the rights not to reply, I was and still looking for cases ideas.
I used 4001 earlier, and it's not perfect. Since sparkybg has drawn the schematic diagram, why can't I try it? Is there a mistake?
The fact that you found time and tried is fantastic, How I can say if there is a mistake if I did not test it. So the 339 circuit is perfect?
I changed my mind and stopped sharing this PCB file.
Maybe you have a short memory, but you already shared this PCB. Once again I can have my personal opinion. I am not going to tell you what you did wrong but that design can be improved that's all. If you do not take criticism then do not share agree.
that had to be 330Uh