Versatile Mic/Audio Preamplifier
Approx construction cost US$27
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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