ISD1820 Voice Recording & Playback ModuleIntroductionVoice Record Module is base on ISD1820, which a multiple‐message record/playback device.It can offer true single‐chip voice recording, non-volatile storage, and playback capability for 8 to 20 seconds. The sample is 3.2k and the total 20s for ..
Features:
Support Micro SD Card (<=2G), Micro SDHC card (<=32G) (high-speed card)The level conversion circuit board that can interface level is 5V or 3.3VPower supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit boardCommunication interface is a standard SPI interface.
Package In..
A piezoelectric transducer has very high DC output impedance and can be modeled as a proportional voltage source and filter network. The voltage V at the source is directly proportional to the applied force, pressure, or strain. The output signal is then related to this mechanical force as if it had..
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