Microphone circuit chart

AnalogKid said:

My high school junior year science fair project. No one, including the judge, believed that I built it from scratch without help. I used the amplifier board from a dead portable reel-to-reel tape machine. The frequency response was terrible because of the equalization, but the little puppy did work. Still have it.

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I have been considering using the preamp module from a CD/radio combination as a preamp for a"stereo" parabolic mic experiment. The reason being that it is a very convenient package, and it probably has an adequate amount of gain. And it is on hand. With a double-sided PCB it is not likely that the parts could be packed any closer. Using a plastic (weather proof) intercom speaker for a microphone will certainly work, consider that the speaker functions quite well on both intercoms and talk-back PA systems.