math’s notes
Aug 01, 2022
3 minutes
BY IRWIN MATH,* WA2NDM
Last month we gave you some interesting ideas for simple projects that you might wish to try. This month we will follow up with some additional tips that we have used in the past which may be of interest, focusing this time on audio.
A Speaker-Mic
First is a way to use a common PM (permanent magnet) speaker as a microphone, in addition to its normal use. As we all know (or should know), a speaker takes an audio signal voltage and applies shows how this voltage can be used as a substitute for a dynamic microphone.
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