Active current source or power resistor?

woody · 18th September 2002, 09:26 PM

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.

Thanks,

Woody

Nelson Pass · 18th September 2002, 10:28 PM

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.

woody · 19th September 2002, 04:33 AM

Thanks for the advice. I have changed to a mosfet current source
and like the results. The Radio Shack 8 ohm resistors that I had
as source resistors may have been adding a little noise!

Thanks,

Woody

18th September 2002, 09:26 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Active current source or power resistor? 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. Thanks, Woody

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18th September 2002, 10:28 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	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.

19th September 2002, 04:33 AM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Thanks for the advice. I have changed to a mosfet current source and like the results. The Radio Shack 8 ohm resistors that I had as source resistors may have been adding a little noise! Thanks, Woody

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