i can say that your PCB layout is not good...
too many angles, unnecessary one... current do like 90 degree connections.
This is actually a bit of a myth, 90 degree corners only become a problem when you get into GHz speed signals, electrons drift at slow speeds when a signal is passing down a trace at approx. 0.1mm/s and bump into everything so a corner poses no problems.
I made a couple of modifications to the boards, then built a prototype and tested it. It was OK so I built these:
I'll be posting the layout later.

I'll be posting the layout later.
In operational amplifier designs for optimal perfomance you need curves.
No you don't, care to explain why you think this? I have done many layouts that are far more sensitive and critical that don't have curves, it is only when toy get to silly microwave frequencies that you need to use curved traces. Maybe curved traces stop the electrons falling off at the corners...or maybe they can just flow better.....😉
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No explanation? If you are going to sprout some theory at least back it up with some science, otherwise its just another misleading myth.
Marce is right. Discontinuities are important to consider for RF designs. You start seeing the effects of 135 º corners at a few GHz and beyond. At DC (including audio), only the resistance, capacitance, and inductance of the PCB traces matter.
HJF: Good to see you included the Thiele network (L+R on the output).
~Tom
HJF: Good to see you included the Thiele network (L+R on the output).
~Tom
The technical part:
http://fruttenboel.verhoeven272.nl/pads/data/mitering.pdf
Who's Afraid of the Big Bad Bend?
http://emcmadesimple.com/pdfs/publications/corners-USA.pdf
The fun part:
OF FLYING ELECTRONS
Article from above, look for routing:
EMC Design for High Speed PCB's
http://fruttenboel.verhoeven272.nl/pads/data/mitering.pdf
Who's Afraid of the Big Bad Bend?
http://emcmadesimple.com/pdfs/publications/corners-USA.pdf
The fun part:
OF FLYING ELECTRONS
Article from above, look for routing:
EMC Design for High Speed PCB's
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