No caps power supply!

[dclapp]

This guy, who obviously knows what he's doing, uses a power supply with NO caps whatsoever!

Scroll down to power supply at

Mick Feuerbacher Audio Projects

Thoughts? Has everything I've been learning been wrong? :-)

Thanks for your comments and wisdom, brothers.

[Pano]

Well practically speaking it does have caps. 2200uF on each leg on each channel. They are next to the chip.

[DF96]

My thoughts:
1. No caps, just the caps which are already there. Ooops, that means caps!
2. Why build a fancy case for a basic chip amp?
3. Why minimise external components when the inside of the chip is crammed full of components?
4. Hanging caps off the pins of the chip may be asking for reliability problems later on, and could also make it harder to ensure ground currents go where they should.
5. He can get away with all this poor engineering because the chip itself has been designed and built by real engineers, so it is robust and has low PSRR etc.

[sreten]

Hi,

I would suggest 1,000uF on each channel on the chip amps,
and 1,000uF or more on each channel in the power supply.

The large charging pulses of remote only capacitors is not
good regarding power supply wiring radiation and the peak
current through any PS connectors. Small capacitors put
directly across each bridge diode is also good for noise.

I cannot see anything to recommend the approach taken
regarding the use of a separately cased power supply.

rgds, sreten.

[Elvee]

Originally Posted by dclapp

This guy, who obviously knows what he's doing, uses a power supply with NO caps whatsoever!

Building a really cap-less power supply is not difficult, but you have to really know what you are doing.

Of course, this is just an exercise in style, since caps are much cheaper and much closer to perfection as energy-storage devices than anything else, but just in case:


As for the construction style, I heavily recommend the "Shanty Town Paradigm": the electrons being totally disorientated by the "Fuzzy Wiring Concept", they become utterly unable to generate nasty resonances, thereby greatly improving reproduction qualities.
(Parallelipeped copper blocks are known to promote resonances)

[sreten]

Originally Posted by dclapp

This guy, who obviously knows what he's doing,
uses a power supply with NO caps whatsoever!

Hi, Well I don't think he does, its style over substance, rgds, sreten.

[marce]

And all that long wiring full of 50/60Hz ripple...

[amptramp]

Maybe this is what you are looking for:

No R, No C, No Batteries, No Hum

It also references this design:

http://greygum.net/sbench/sbench/norc_pa.html

[Elvee]

Originally Posted by amptramp

Maybe this is what you are looking for:

No R, No C, No Batteries, No Hum

It also references this design:

An Amp with no R's and no C's

Well well, little did I suspect when I proposed the circuit above that somebody had already been fool enough to actually use it.

But I am glad I didn't see it before I proposed my version: mine doesn't rely on non-linear elements like regulator tubes, and behaves essentially like a simulated capacitor, with only one layer of power inductance.

[gorgon53]

Compare the energystorage, loss, price, size and weigth of a cap to those of a equivalent
inductor and you will see how silly it is to use only inductors as energystorage device. The
only area where inductors trumpf is at temperature, lifespan, or endurance extremes.
Usually the best results are obtained by using the best possible compromise for a certain application, and that almost always will include caps, especially in powersupplies.