This may or may not be a daft question here, but..
If the system is of restricted bandwidth, would not this fact do the job, or
do you get funny effects with wider bandwidth signals. Cannot say that
feeding nice quality down grotty phone lines sounds any less grotty if band
limited or not.

The nasty bodgit design inc solution is a high value capacitor in series
with the mic and a vvery ngative feedbacked op amp for the amp which will
maybe not be as noise free as it could be though.

Brian

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"JohnT" wrote in message
...
I need a small, simple preamp to tailor the output of a standard
electret mic, to limit the bandwidth to approximately a telephone, say
300 - 3400 Hz and with fairly sharp cutoff.
Must be available quickly, I haven't time to design and build. If the
project works I will need several.
Most simple off-the-shelf preamps do not have tone controls, or are
large and unnecessarily complex for my purpose. Google hasn't been my
friend so far.
Any ideas?
Thanks.