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Old 21st July 2008, 09:55 PM   #1
M.Joshi is offline M.Joshi  United Kingdom
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Join Date: Dec 2003
Location: London
Post TI (Burr Brown) INA217


I would like to use the INA217 as an electret insert pre-amp and have the option of driving either an unbalanced or balanced output.

I was unable to find any suitable circuits for this and the design notes in the datasheet don't mention electret inserts.

Is it fairly easy to interface a 2-terminal insert to the differential input of an INA217 IC?

I intend to run the circuit from a 9V battery - will I require two for a balanced output or can it be achieved with just one?

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Old 21st July 2008, 10:19 PM   #2
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Join Date: Jul 2002
Location: England
There's a simple mic. preamp circuit on the linkwitzlab Lab website:

Click the image to open in full size.

Hopefully this is useful to you

Note: You could use the "spare" opamp in the dual-opamp shown in an inverting configuration and actively drive the balanced output.
...if it ain't broke don't fix it - make it BETTER!
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