noisless biasing

[mhartington]

So i built the sweet16 and agree with other comments made that the hum is a little bit much.  I came across the "noiseless biasing" schematic and was wondering if it would take out some of the hum? if not are there any ways other ways to reduce the excess hum?

both schematics for the original and the "noiseless biasing" are here
http://www.aronnelson.com/gallery/main.php/v/WGTP/Sweet16.gif.html?g2_imageViewsIndex=1

[R.G.]

So i built the sweet16 and agree with other comments made that the hum is a little bit much.  I came across the "noiseless biasing" schematic and was wondering if it would take out some of the hum? if not are there any ways other ways to reduce the excess hum?

Noiseless biasing is a term for a technique to minimize the thermal noise contribution of the bias resistors for an amplifier. I found it in Ott's book on noise reduction techniques.

It will do nothing at all for hum.

Hum is a multilayered thing. Hum is everywhere, and gets into circuits by conduction, capacitive pickup, and inductive pickup. Every single component, including the interconnecting wires between parts can cause hum pickup. The trick to reducing hum is designing for low hum pickup, and doing layouts that are hum-resistant.