EPE Online Versatile Mic/Audio Preamplifier Construction Project













Versatile
Mic/Audio Preamplifier
Approx construction cost
US$27







Use
one of the latest chips on the block to produce an audio pre-amp with AGC
compression, limiting, and noise reduction.
Intended primarily as a means of processing
microphone inputs to computers, the SSM2166P integrated circuit (IC)
--manufactured by Analog Devices-- has a wider range of possible
applications. Public address and surveillance systems immediately spring
to mind, and the device will be of particular interest to radio
enthusiasts, especially now that the popular Plessey 6270 IC mic/pre-amp,
with voice gain, is no longer available.

This construction article describes
how the new IC can be used for a variety of signal inputs, and additional
circuitry is given for readers who require a signal-strength meter.

More details on this
construction project can be found in the May 2000 issue of EPE Online, the world's first web-delivered electronics
and computing hobbyist magazine.
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