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LM3914 Features and Specifications
Make sure ground terminals of both Input and Output supplies are same
Support AT instruction
All the pins
Nokia 5110 LCD module uses the PCD8544 interface IC making it easy to use with low-level microcontrollers
ISD1820 Sound/Voice Recorder Module with Speaker power LM3914 Features and SpecificationsThe ISD1820 is a record and playback module that can record a sound and play it whenever required. The module comes with a microphone to record the sound and an 8 ohm speaker to play the recorded sound. By default, the recording time is 8 seconds but can be extended up to 20 seconds by replacing a single resistor. The operating voltage is from 3V to 5V. Simply power the ISD1820 Voice module and press the record (REC) button, record the audio, and then
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