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Post by ajay944 on Oct 14, 2008 8:46:32 GMT
Hi there, I use a wireless headset mic for my vocals. The receiver unit is battery operated and literally chews battries, so I removed the batteries and connected a DC power supply to the poles in the receiver. This works fine except for one thing, I get a constant hum on my speakers. How can I, if I can at all, get rid of the hum?
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Post by Emerald Midi on Oct 14, 2008 14:34:27 GMT
Strange, but it could be an earth problem. I use to have a humming sound with my laptop until I removed the earth wire from the plug  But in you case it may well be something quite different, but sure give it a try |
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Post by thingyy on Oct 14, 2008 21:29:21 GMT
It would pay you to try and find a transformer designed for audio.A good one is the Roland one supplied with the MT32 sound module.It has a fuse inside and a filter.The fuse is easy to get to, and is a good safety device if you have body contact with the "device".
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Post by ajay944 on Oct 15, 2008 15:13:21 GMT
hanx, the power supply with a filter sounds like a great idea...do you have any idea whether the voltage is switchable or not? I require 3v (substitute for 2 AA batteries)
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Post by thingyy on Oct 15, 2008 21:34:30 GMT
No it was 9volts I amp.[If you have a few electronic clues you can reduce the volage using resistors.] Ask in a hi-fi shop maybe able to try a portable CD player one.
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