Accurate Acoustic Sensor – Sound Frequency to Voltage Converter
Sensor

Accurate Acoustic Sensor – Sound Frequency to Voltage Converter

The project presented here is a sensitive sound sensor. The circuit converts sound frequency and outputs DC voltage.  The board consists of LM358 OPAMP and LM2907 IC. LM358 is used as a dual-stage microphone preamplifier and LM2907 acts as a frequency to voltage converter. The circuit...

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Universal Op-Amp Board for SMD SOIC-8 Package
Basic Electronics

Universal Op-Amp Board for SMD SOIC-8 Package

This is an easy to build and very useful project for hobbyists and students to learn and create OPAMP-based projects. The project accommodates a single op-amp in a SOIC8 package. The project provides the user with multiple choices and extensive flexibility for different applications...

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2.022
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Universal Op-Amp Board for DIP-8 Package
Basic Electronics

Universal Op-Amp Board for DIP-8 Package

This is an easy to build and very useful project for hobbyists and students to learn and create op-amp-based projects. The board accommodates a single op-amp in DIP-8 package. The project provides the user with multiple choices and extensive flexibility for different applications...

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1.592
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Microphone Preamplifier – Sound Sensor
AudioTop Stories

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...

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30V/4A Adjustable Power Supply (CC-CV)
Power supply

30V/4A Adjustable Power Supply (CC-CV)

By Hesam Moshiri and Anson Bao In this article/video, I introduced an adjustable 30V-4A linear power supply that provides constant voltage and constant current adjustment. The output noise of the power supply is low and has measured using the power analysis feature of the Siglent...

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Optically Isolated Analog Input Module for Arduino
Arduino

Optically Isolated Analog Input Module for Arduino

This is an isolated analog input module that is useful for interfacing Analog signals of various types originated from analog sensors and field devices. The module is very useful for in-process controls, factory automation, industrial applications, etc. Interfacing an analog voltage, an...

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Liquid or Air Pressure Switch with Relay
Sensor

Liquid or Air Pressure Switch with Relay

This pressure switch project is built using a piezoresistive transducer, LM358 OPAMP as comparator, and a relay. The circuit activate the relay when the pressure in a system exceed a given set-point. Basically, this switch can power ON or OFF a pump, valve, motor, when certain pressure...

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Sound Sensor with onboard Relay Arduino Nano Shield
Arduino

Sound Sensor with onboard Relay Arduino Nano Shield

This sound sensor with Relay driver shield for Arduino Nano can be used to develop sound-activated ON/OFF switch or other projects that require sound senor. LM358 op-amp is used as the amplifier, 1st op-amp amplifies the microphone signal, and 2nd op-amp works as a half-bridge rectifier...

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