Thermal Mass Air Flow Sensor – Constant Temperature Anemometer

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...

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1.140
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Sound to RC Servo Driver v2.0 – Arduino Compatible

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 board is Arduino compatible and consists of LM358 OPAMP, ATMEGA328 microcontroller, microphone, and a few other components. The project moves the RC servo once...

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1.522
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13 Comments
Accurate Acoustic Sensor – Sound Frequency to Voltage Converter

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...

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1.518
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0 Comments
Cooling Fan Controller Using Temperature Sensor LM35

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...

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2.110
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1 Comments
Universal Op-Amp Board for SMD SOIC-8 Package

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...

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1.836
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Universal OPAMP Board for DIP-8 Package

Universal OPAMP 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...

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2.084
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0 Comments
Microphone Preamplifier – Sound Sensor

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....

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2.240
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3 Comments
Analog Light Sensor + Light Sensitive Switch using OPT101

Analog Light Sensor + Light Sensitive Switch using OPT101

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...

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5.284
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