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Old 11th January 2008, 01:20 PM   #1
Progg70 is offline Progg70  Sweden
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Cool Looking for nice power supply designs

I have a Class-A amp who needs about +/-16V and 4 amps as idling current. With an ordinary design with 60 000 uF for each +/- the trafo have 700VA 16V I have to much hum in the silent parts of the music. Can some one give me tips for nice power supply designs?

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Progg70
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Old 11th January 2008, 01:45 PM   #2
gootee is offline gootee  United States
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Can you post a picture of the internal connections of the amplifier that you have built, and, if possible, a schematic? Your hum problem may not depend only on the power supply.
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Old 11th January 2008, 01:57 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
post schematic and photo of the wiring, if possible.

Is it single ended or push-pull or bridged?
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Old 14th January 2008, 01:33 PM   #4
Progg70 is offline Progg70  Sweden
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It is a single end config. If I change to lover current there is no problem with hum, very low hum. I have already tested different config. And I use a good one. I only need a good power supply who meets the current in idle 4 amp.
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Old 14th January 2008, 01:46 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
try using an rCRC PSU or better still rCLC PSU.
the r= transformer resistance.
C=smoothing capacitance. split into two stages.
60mF sounds about the minimum for a 4A bias current.
I reckon you should add an extra stage giving 0r2, 20mF, 0r2, 60mF. and see if that helps.
But, have a thorough look at your power grounding and ensure it is separated from your signal grounding.
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Old 14th January 2008, 03:14 PM   #6
Eva is offline Eva  Spain
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A switching mode power supply can produce a humm-free regulated output voltage without audible noise or bulky capacitor banks and toroids. Sometimes there are bargains on ebay...
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Old 15th January 2008, 10:23 AM   #7
Progg70 is offline Progg70  Sweden
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OK I try something out…
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