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Re: Mic Preamp [message #14439 is a reply to message #14433] Mon, 17 September 2007 17:58 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

An AC power supply rectifies DC power from AC, so there is necessarily a filter. You'll have rectifier switcing artifacts and low frequency AC noise to deal with. A battery does not have these issues.

A battery has higher internal source impedance and has to be recharged or replaced, so those are the downsides to a battery. But it is pretty noise free and can be an attractive option, especially in a circuit like this that needs to be noise free and that has very low curent draw.


 
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