Op amp supply Quiz - what sounds best ?

[BDWoody]

An op amps Power Supply Rejection ratio ( PSRR ) and its Common Mode Rejection Ratio ( CMRR ) are discussed here
https://www.arrow.com/en/research-and-events/articles/why-cmrr-and-psrr-matter-when-choosing-op-amps

The discussion aims to examine the use of components immediately beyond the op amps voltage pins ( to see if there is anything better out there than as exampled 2x 100 ohm resistors in a Pioneer PDS507 ) to assist how current is drawn from the comparative ( to the op amp specifications ) raw supply.

Boldly we are attempting a discussion to encourage the provision of the promise that op amps provide with their magnificent specifications - but strangely rarely deliver in audio circuits. We have focus on what might improve them at their voltage pins - at little additional cost ( hopefully )

Suggesting 4 components or less for both voltage rails, its a challenge I agree.

Right... Nevermind.

 

[DonH56]

I would instead try everything though NOT to force return current into the ground plane to intermodulate with the analog supplies bypassing, as the analog supplies bypassing has its own purpose. Star earthing though may circumvent.

Current is a loop. If you do not use a local return you are creating a bigger loop and more potential for noise. Star grounds work by isolating the source and return paths for individual circuits and depend upon a low-impedance tie to some reference ("earth") ground to prevent the star ground point from becoming just another noise source. The (a) purpose of decoupling is to constrain the current loops and minimize voltage variation. Injecting the return current someplace else causes problems. Pick up a copy of Practical Electronics or some basic text book for an overview of Kirchoff's current and voltage laws (KCL/KVL) -- they are probably in Wikipedia.

@SIY -- right...

 

[March Audio]

Chris is famously ignorant of basic electronics. It's painful watching you guys indulge him.

Another one gone on ignore, he is just wasting everyones time.

 

[Veri]

Another one gone on ignore, he is just wasting everyones time.

 

[solderdude]

The worst part is spreading misinformation (mixed with some truth). Paul McClown is also very good at this.
First with his theories about LDR volume control and now he is using components in the way they are not intended to be used.
He thereby violates his own theory, as to wanting a higher series resistance, while in reality he made it worse than the original situation.
One has to reply so others don't start to believe the posted nonsense.

 

[SIY]

One has to reply so others don't start to believe the posted nonsense.

As seen here, that just generates more nonsense. Your intentions are admirable, but the only way to slow down the spew from its purveyors is to call it out once, then go away. It’s been called out more than once. Now go away.

Please trust the Old Man here, there is no conservation law for willful stupidity. You can’t fix it. Anyone dumb enough to fall for it won’t be convinced by actual facts.

 

[DonH56]

Against stupidity the very gods
Themselves contend in vain.

- Johann Christoph Friedrich von Schiller

(And I thought it was by Isaac Asimov. )

 

[solderdude]

Anyone dumb enough to fall for it won’t be convinced by actual facts

Very true.

 

[stereo coffee]

Thanks to those who contributed, with some great ideas @KSTR in particular.