Although Apple's 4.7-inch "iPhone 7" may replace a 3.5mm headphone jack with a second speaker grill, that grill may not actually have a speaker behind it, according to leaked schematics posted on ...
This low noise microphone amplifier is build with MAT02 produced by PMI. This mic amplifier is very performant and has a very low noise level. The amplification can be 20dB or 23.5dB (10x or 15x ) ...
A super-sensitive contact microphone, called the "Insect Microphone", can pick up the footsteps of crawling insects. It was developed to convey on television the reality of the world of small insects.
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