[sdiy] About bypass capacitors

[John Luciani]

On 1/22/07, Charles Bisaillon <sdiy at oveloe.com> wrote:
> I did not experiment enough to see a difference in sound or stability when I
> put capacitors across +15/ground and -15/ground. Can someone kindly explain
> what are the benefits of this and what cap values are best.

The capacitors are there to provide a stable power supply voltage.
The capacitor will filter power supply noise and provide a low impedance
source for surge currents.

Typically you will see values of 0.1uF very close to the IC power input.
If you provide filtering at the board level it is usually in the 1-10uF range.

There is a very good application note from Analog Devices about grounding
and decoupling called  "An IC Amplifier User's Guide to Decoupling,
Grounding,. and Making Things Go Right for a Change" which is  by Paul
Brokaw.

http://www.analog.com/UploadedFiles/Application_Notes/135208865AN-202.pdf

(* jcl *)

-- 
http://www.luciani.org