Microphone Preamplifier – Sound Sensor

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https://www.electronics-lab.com/project/microphone-preamplifier-sound-sensor/

This is an easy to construct dual-stage microphone pre-amplifier. The project can be used as a sound sensor or microphone pre-amplifier. The 1st op-amp pre-amplify the very low-level signal coming from the condenser microphone and 2nd op-amp provides more boost to the audio signal. The pre-amplifier is an important building block for many audio communication […]

ThermoDuino – OLED Display Thermometer and Tiny Arduino Board

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https://www.electronics-lab.com/project/thermoduino-oled-display-thermometer-and-tiny-arduino-board/

  ThermoDuino is a mini Arduino compatible board that consists of LM35 temperature sensor, ATMEGA328 chip, and 0.96″ OLED display. The board has been designed to measure temperature. We have used the LM35 SO8 SMD sensor which is connected to A0 analog pin of the chip, and the OLED display is connected to A4 and […]