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Circuits mic microphones preamp preamplifier lm386 controller rectifier Speech recognition jukebox Made microphone matchbox holes four each side width two make
Schematic circuit microphone overall figure Simple microphone to speaker amplifier circuit How was it made?
How to make a matchbox microphone out of a matchbox and pencil leads .
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Speech Recognition Jukebox
How to Make a Matchbox Microphone Out of a Matchbox and Pencil Leads
How was it made? - The Matchbox Microphone (PBL PROJECT)