Is the battery the cleanest PSU of all?

[neazoi]

Hello,
Is a single charged battery the cleanest PSU one can have?
I have heard something about noise from internal chemical reactions, but is there any cleanest psu?

 

[BradtheRad]

Haven't heard of anything cleaner. A battery is free of hum and ripple.

A capacitor has a stable output but its volt level drops steadily.

 

[keith1200rs]

**broken link removed**

Keith

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Search the internet for electrochemical noise in batteries' - there are quite a lot of references.

 

[neazoi]

Yes of course I expected to have some noise because of electrochemical reactions, but my practical experience tells me that this is the cleanest of all other types of PSUs. Whenever I connect a battery on sensitive equipment, all hum dissapear and noise goes down.
Although I have not made any practical measurements, Jean Hiraga in his battery powered amplifiers shows with measurements the lowers noise achieved by batteries. But I am not so confident.
I wonder if a well designed regulator will benefit from a battery as a psu source at all.
I have an example here **broken link removed** Where a two stage regulator is used to regulate and to clean the DC. Will this benefit from a battery source at all?
Perhaps an advise of how to measure the PSU noise will help more.

 

[jeffrey samuel]

some chemical reactions involve excitation of electrons which produce noise in realtime

but compared to other PSU batteries are the most silent ones