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Old 18th September 2002, 08:26 PM   #1
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Location: Tyrone Ga. U.S.A.
Default 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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Old 18th September 2002, 09:28 PM   #2
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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.

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Old 19th September 2002, 03:33 AM   #3
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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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