Electronics > Projects, Designs, and Technical Stuff

Audio HP Amp TI LM4811 - am I getting crazy?

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magic:
Again, are you sure there is no problem with VDD and the chip isn't taking power through ESD diodes from other pins?

Saimoun:
Here is the original schematics and PCB.

Schematics (ignore the fact that all nets have a "2-" in front of the name):



PCB top:




PCB bottom:


OM222O:
the pcb is very messy and non standard (just look at the 10 pin SOIC, looks like a 6 pin jobby  :palm:) and there was a problem with your schematic it seems.

Please upload the schematics.
Also this seems like easyeda. If so please share the link rather than photos.

magic:
No idea :-//
Any chance they sent you a wrong chip?

BTW, simply rotating C12 180° would decrease the length of connection from C12 to the GND pin for free. Probably not important here.

Saimoun:

--- Quote from: OM222O on July 30, 2020, 08:28:59 am ---the pcb is very messy and non standard (just look at the 10 pin SOIC, looks like a 6 pin jobby  :palm:) and there was a problem with your schematic it seems.

Please upload the schematics.
Also this seems like easyeda. If so please share the link rather than photos.

--- End quote ---

Sorry the picture upload went wrong - the post above has the schematics now.

And yes the PCB is a bit messy - it's just a PCB to test the IC. And actually the strange solder pads for the IC is on purpose, it is my way to be able to solder a tiny package as I have never soldered SMD before. But as I said the soldering went really well, no shorts and I tested each individual pin to make sure it was connected.

Here is a picture of the soldered PCB - the "dot" of the IC is at the top right.

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