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Old 10th December 2012, 06:12 AM   #1
fbee is offline fbee  Germany
diyAudio Member
Join Date: Mar 2010
Default Stable low noise PS for active crossover boards?

Hi folks,

Still having + and - shunt regs in place to power an active x over with +/- 15V. But I experienced some noise, which I suspect to come in via the cable (1,5m) from the PSU to the board. The boards DC supply filter is attached.

12 LM4562 opamps on each board, that need a stable supply.

I m planning to rework (regs closer to the board but transformer separate) and wonder what kind of regulator would fit best ?
Jung, Salas simple or v1.2, twisted pair ,....or slower regs with capacitor banks?

Use regs after the onboard DC supply filter of the board or
remove this onboard DC supply filter circuit ?

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Old 13th December 2012, 05:06 AM   #2
fbee is offline fbee  Germany
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....would it make sense to place ultra low noise regs TPS7A3301 (-) and TPS7A4700 (+) behind shunt regs?
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Old 13th December 2012, 04:59 PM   #3
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I presume you have already experimented with series regulator.

Next step is probably a shunt regulator.
It does not need a series regulator in front of it.
It needs a current limiter. A resistor does that job.
Or you can use a current source instead of the resistor.
If you want a completed design then you must try the Salas Shunt. There are three or four different versions.

All PSUs benefit from extra attenuation of mains harmonics, no matter what some builders claim about making amplifiers sound "flat" or lifeless.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 13th December 2012, 05:09 PM   #4
Davey is offline Davey  United States
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Join Date: Dec 2001
Location: Bremerton, WA.
The Orion ASP input configuration may not be friendly to a shunt-regulated supply. I would use a series-regulated supply.....unless you're ready to do some fiddling.


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Old 14th December 2012, 05:51 AM   #5
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Location: Dona paula, Goa
Stable is simple, for low noise, add capacitance multiplier or noise cancelling circuits.

Gajanan Phadte
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