Active current source or power resistor?


Paid Member
2002-01-15 12:57 am
Tyrone Ga. U.S.A.
I just built a small SOZ and while I am more than pleased with it
I would like to replace the source resistors with an active current
source so I don't need a ballenced input. Would a fet as a active current source be noiser than a 50 watt Dale chassis mount resistor in this aplication.



Nelson Pass

The one and only
Paid Member
2001-03-29 12:38 am
Making me trundle all the way over here from the Pass
forum, where this belongs, huh?

The current source biasing the Mosfets from the negative
rail is a superior technique, and was omitted from the
original article only due to its added complexity.

If you place a nice filter cap across whatever voltage
source is biasing the current source Mosfet (if you choose
to use a Mosfet ) then it will be plenty quiet.