Скачать или смотреть Digital Stethoscope Amplifier Explained

An example of Digital Stethoscope Amplifier is explained in this circuit analysis video. The Stethoscope's microphone picks up patient's signal (for example heart beats or bowel movements). This analog signal is initially weak and noisy and hence it needs to be properly enhanced and amplified (aka signal conditional or signal interfacing). An example of the microphone signal amplification and noise removal is explained in this video using dual op amp stage amplifier and bandpass filter. In order to achieve proper signal conditioning, very low drift (or zero drift) FET-input op amps from Texas Instruments or Analog Devices are highly recommended to make sure op amp input voltage drift is limited to sub micro volt level with minimal thermal drift. This video explains How the circuit works and computes the overall voltage transfer function of the Stethoscope Amplifier for the microphone signal at input.