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Old 4th September 2003, 09:25 PM   #1
David B is offline David B  United States
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Default powering gain clone and active equalizer

This is a dumb noobee question but I'm hoping someone can help me.

I'm building a gainclone and want to put an active equalizer (4th order LR) in front of it. Needless to say, the PS voltage for the equalizer is different (lower) than the gainclone. I have a design for the power supply for the equalizer (from the Linkwitz lab pages). Will there be any problems if I power the GC and the equalizer each from their own power supply, or should I try to figure out a dropping resister to get the right voltage for the equalizer off of the GC power supply? or is there a better approach?

TIA,
David
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Old 4th September 2003, 09:33 PM   #2
JoeBob is offline JoeBob  Canada
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Seperate PSUs would be the ideal solution.
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Old 4th September 2003, 09:47 PM   #3
David B is offline David B  United States
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Default decoupling caps?

Thanks, Joe -

In that case, would I need decoupling caps after the equalizer and before the GC -- or is it safe to try it without and see what happens? If caps are required what value should I try?

- David
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Old 4th September 2003, 10:12 PM   #4
JoeBob is offline JoeBob  Canada
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If your equlization stage does not put out any DC offset, then you should be fine. Test it without a cap into a resistor as a load, if there isn't DC offset you're all good to go.
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Old 4th September 2003, 10:44 PM   #5
David B is offline David B  United States
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Great! Thanks, JoeBob
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Old 2nd January 2006, 01:53 AM   #6
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Can you put the equalizer schematic please?

I need one !
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Old 4th January 2006, 03:40 PM   #7
heater is offline heater  Finland
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How about this one:

http://sound.westhost.com/project75.htm
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Old 4th January 2006, 04:10 PM   #8
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Quote:
Originally posted by JoeBob
Seperate PSUs would be the ideal solution.
y?

deriving voltage for preamps from amp supply works fine too.

use following ckt,its working great for me,all res and diodes r atleast 1w.
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File Type: jpg preamp supply from amp supply.jpg (5.1 KB, 242 views)
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Old 5th January 2006, 02:34 AM   #9
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Quote:
Originally posted by heater
How about this one:

http://sound.westhost.com/project75.htm
WOW


I just want something like 5 bands or less !
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Old 5th January 2006, 04:22 AM   #10
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Add diodes as shown and see the results !!!
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