Electronic stethoscope Lab Report example
High school
Lab Report
Design & Technology
Pages 10 (2510 words)
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Name: Institution: Course: Topic: Date: Introduction This is a project aimed at designing an electronic stethoscope. The circuit is built using a PC board and battery as source of power. Resistors, ohms and capacitors are used to regulate voltage and current flow.


Components functions LM386 Low Voltage Audio Power Amplifier is an auditory amplifier designed for exploitation in low electrical energy consumer purpose which provides both current gain and voltage for signals. Hence, power amp with variable gain is considered with the assistance of op-amp LM386. It acts as a low-noise microphone pre-amp. Its gain is approximately 3.9 because the high productivity impedance of the exhaust of the FET within the electrets microphone makes efficient input resistor to be approximately 12.2K. MPF102 Transistors’ purpose is to manage current by an electric field; voltage produces only a small raise in drain current. 1K Ohm 1/4-Watt Carbon Film Resistor provides accurate amounts of resistance in electric circuits. Resistors are marked both in regards to their resistance (1K ohms) and their capability to dissipate high temperature energy (1/4-watts). 1M Ohm 1/4-Watt Carbon Film Resistor refers to 1M ohm resistance and a quarter heat dissipation. 10 ohm 1/4W 5% Carbon Film Resistor and 4.7K Ohm 1/4-Watt Carbon Film Resistor likewise give the corresponding resistance and dissipation. (x2) 0.047µF 50V 10% PC-Mount Capacitor separates the microphone route from the LM324 quadruple functioning amplifier. This way, the LM386 can operate at the full 12 V without hindering the voltage of the microphone circuit. ...
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