Reverse engineering: Class AB STA540 with pre-amp - diyAudio
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Old 15th February 2016, 12:46 PM   #1
yatesw is offline yatesw  United Kingdom
diyAudio Member
Join Date: May 2015
Location: London/Birmingham
Default Reverse engineering: Class AB STA540 with pre-amp

I bought this little beauty 3 months ago as a quick replacement for a more expensive system, its an STA540 with a pre-amp of NE5532 (though I have replaced with OPA2134s).

eBay link & AliExpress Link

I haven't actually replaced it yet as I really love the little thing, and unconventional methodology and simplicity, but some improvements could be made, I'd love to add the power supply to the board and re-distribute the PCB so that it'll fit into a case I have here, make it "all in one".

Now for the plea:
Searching the depths of the internet I cant seem to find its schematic, & my dyslexia is really hampering my ability to convert the PCB into a Schematic i can use, I just cant seem to get it right in simulation. I'm fairly certain it's only a double sided PCB. So I have come here, to you fine folks for a hand in deciphering it.

I have sourced the top and bottom images of the PCB and also a few other bits(a system I believe is very similar to it).

Something that will take me 6hours may only take you 15min which is why I'm asking for a little help

Attached Images
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File Type: jpg IMG_5724.jpg (339.9 KB, 116 views)
File Type: jpg IMG_5725.jpg (478.0 KB, 113 views)
File Type: png amplificador-tda7379-tda7377-tda7375-esquema.png (39.2 KB, 116 views)
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Old 16th February 2016, 01:20 PM   #2
mboxler is offline mboxler  United States
diyAudio Member
Join Date: Nov 2011
This may not help, but here is a link to an STA540 kit. Scroll down to view the schematic. It's a 2 channel amp, not 2.1.

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