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Ultra clean universal guitar pedal power supply
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Old 27th August 2014, 05:46 PM   #1
rohansinha2000 is offline rohansinha2000  India
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Exclamation Ultra clean universal guitar pedal power supply

Today I have completed a universal power supply for dc 9 volt. But i got some humming. Please rectify the diagram.
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Old 27th August 2014, 06:34 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Are you sure it is coming from the power supply and not an earth / ground loop? Most Wall Warts are rough and ready, unregulated etc and are perfectly fine. Most pedals have smoothing and filtering in them.
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Old 27th August 2014, 10:49 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Plug the supply in.
Unplug it and as the power supply dies does the hum go ?

I often use a floating mp3 player and my amp hums with it.
If I earth the amp zero volts the hum goes away.
Could be you dont have an earth in the system ?
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