Thermal Mass Air Flow Sensor – Constant Temperature Anemometer
https://www.electronics-lab.com/project/thermal-mass-air-flow-sensor-constant-temperature-anemometer/
The CTA mode (Constant Temperature Anemometer) consists of a simple feedback circuit for temperature regulation of the heater on the flow sensor and, as flow speed changes the thermal energy loss by the heater changes. By adapting controllers, a constant temperature difference between the heater and the temperature sensor can be achieved. The supplied electrical […]
Sound to RC Servo Driver v2.0 – Arduino Compatible
https://www.electronics-lab.com/project/sound-to-rc-servo-driver-v2-0-arduino-compatible/
The project presented here is made for applications such as Animatronics, Puppeteer, sound-responsive toys, and robotics. The Arduino compatible board consists of LM358 OPAMP, ATMEGA328 microcontroller, microphone, and other components. The project moves the RC servo once receives any kind of sound. The rotation angle depends on the sound level, the higher the sound level […]
Accurate Acoustic Sensor – Sound Frequency to Voltage Converter
https://www.electronics-lab.com/project/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 provides analog voltage output when it detects sound. The […]
Cooling Fan Controller Using Temperature Sensor LM35
https://www.electronics-lab.com/project/cooling-fan-controller-using-temperature-sensor-lm35/
The project presented here is a low-cost solution for heat management of the heatsink and various equipment that requires automatic control of a cooling Fan. The project is built using a very cheap LM358 OPAMP. LM358 is used as a comparator, and a trimmer PR1 is provided to set the temperature threshold (Fan ON trigger […]
Universal Op-Amp Board for SMD SOIC-8 Package
https://www.electronics-lab.com/project/universal-op-amp-board-for-smd-soic-8-package/
This is 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 SOIC-8 package. The project provides the user with multiple choices and extensive flexibility for different applications circuits and configurations. It provides the user with many combinations for various […]
Universal OPAMP Board for DIP-8 Package
https://www.electronics-lab.com/project/universal-op-amp-board-for-dip-8-package/
This is 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 circuits and configurations. It provides the user with many combinations for various circuit […]
Microphone Preamplifier – Sound Sensor
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 […]
Analog Light Sensor + Light Sensitive Switch using OPT101
https://www.electronics-lab.com/project/analog-light-sensor-light-sensitive-switch/
You may have seen many light-sensitive switch circuits based on an LDR sensor. Usually, the sensitivity of the LDR based light sensor is poor. We wanted a very sensitive light switch hence we decided to make a circuit based on a light sensor rather than LDR. After a little research on the internet, we found […]
Optically Isolated Analog Input Module for Arduino
https://www.electronics-lab.com/project/optically-isolated-analog-input-module-for-arduino/
This isolated analog input module is useful for interfacing Analog signals of various types originating from analog sensors and field devices. The module is beneficial for in-process controls, factory automation, industrial applications, etc. Interfacing an analog voltage, an analog sensor to Arduino or other various microcontrollers with optical isolation is very easy with this module. […]
Liquid or Air Pressure Switch with Relay
https://www.electronics-lab.com/project/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 is reached. A trimmer potentiometer is provided to […]