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Old 4th May 2011, 08:46 AM   #1
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Default Good Buffer/Preamp circuit for electret mic

Hi,
I need to mic up some fiddles but I dont want to spend heaps on real instrument mics. I would like to build some mics using cheap electret inserts. I have tested the quality and it seems pretty good, but I read somewhere that they need a preamp for longer cables to reduce the impedance or something to prevent noise.
Does anyone know of a good discrete circuit to use that uses very few transistors? There's one that looks good on the net but uses heaps of transistors. What if I just put a simple class A amp like this?
Click the image to open in full size.
I might use phantom power, and don't need a balanced output.
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Old 4th May 2011, 10:44 AM   #2
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Hi Caleb,

That circuit is not suitable. If you intend to use a phantom power supply, you must have a balanced/differential output. Cheap electret inserts use to have a built-in impedance converting JFET. This circuit could work with a Panasonic WM-61 and phantom power (9-48 V).

Click the image to open in full size.

Roger
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