Fake STK3152/STK3102

[davidsrsb]

I added copper floods to the output tabs

 

[schillg11]

Hi David,


thanks for the perfect base to play with this module.


Günni

 

[davidsrsb]

The BOM

 

[davidsrsb]

Some layout cleanup and more cooling for PNP outputs

 

[davidsrsb]

PDFs of the layers

 

[usersky]

Guys, why don't you make and sell this think advertised as discrete recreation of 3102? I would buy one in a blink.

 

[Klemens]

Hello!


I own a PM80 SE that has a failed STK3152 that replaced an already failed 3102 around 15 years ago. It's an insane coincidence that David created a replacement just before I was in need for a repair.


A friend and I ordered a few boards made with David's design from China which will arrive next week presumably. I will take pictures and report if and how well it works!

 

[davidsrsb]

Good luck with them, if they do the job, please make a donation to a charity of your choice

 

[Klemens]

Thank you very much for your work! Completely forgot to mention that

...if they do the job, please make a donation to a charity of your choice

Will do so!

 

[Klemens]

The replacement is working and producing great sound!


Pics:

 

[davidsrsb]

Well done.
Making the PCB in 1.0mm thick rather than standard 1.6mm would help even more if you have a heatsink on the back like in the above photos

 

[Klemens]

I didn't think about the thickness when I ordered the pcb. Now I would order it definitely in 1mm or thinner.

The STK that was in it had a heatsink merged with the pcb.

Maybe in a few years it blows again then I'll optimize the heatsink So far it's been running day and night

 

[davidsrsb]

I attempted to fix some of the weaknesses of the original module and the fakes. Splitting the high voltage dropper resistor that seemed to degrade into R7/R10 and the higher power output devices should help reliability.
If anything is getting too hot, let me know.

 

[schillg11]

Hi David,


can you please repost the Gerbers for your a -version. there are some double names, espcially for the coppers and the mask F and B and some masks dont fit perfect (paste and mask)


Thanks in advance
Günni

 

[davidsrsb]

This is the latest KiCad 5.1.0 generated version.
I see what happened, KiCad has changed the Gerber file names slightly and I mixed a version.
The circuit is unchanged, I have just cleaned up the tracking a little to improve clearances and maximised copper area on the output devices

 

[Klemens]

I attempted to fix some of the weaknesses of the original module and the fakes. Splitting the high voltage dropper resistor that seemed to degrade into R7/R10 and the higher power output devices should help reliability.
If anything is getting too hot, let me know.

The split is clever. Didn't notice that until you mentioned it.

I honestly doubt it will break down anytime soon by overheating. If that counterfeit lasted for over a decade your design will for sure

 

[davidsrsb]

The unknown is the heating when the speaker output is shorted. What happens to this module depends on the details of the power output stage wrapped around it. Some STK3102 based amplifier schematics that I have looked at seem to lack output protection

 

[schillg11]

thanks davidsrsb for the prompt service of reposting the Gerber files . i think i will try a 0.6mm PCB with a heatsink attached.


Gunni

 

[pepestudios]

hello to all, excellent the replacement module of this stk, consult, in which site you can get the pcb or who makes it, here in Argentina it would be very expensive to make a single piece, any response is assaulted ...

 

[schillg11]

Hello pepestudios,


i have several pcb of the latest version (FR4 0.6mm, matte black)and the version before (1.6mm a green) . Feel free to ask for and i can send it to Argentina.


BR
Günni