Tag: LM2907

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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Over Speed Sensor – Over Speed Alarm using Magnetic Pickup Sensor

This is an over-speed sensor module, that provides an audible warning and signals output when the speed of a machine is above a set point. The module can be used in applications such as Engines, Machines, Sports machines, and Fitness Equipment. The speed of the machine or engine can...

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Single Key Touch Sensor using LM2907

This is a single key device featuring a touch ON (Momentary) output. The project is built using the LM2907 chip. The board provides stable sensing and has a wide working power supply range 5V to 12V DC and consumes 20mA. D1 power LED, D2 function LED. Touch sensors are used in many...

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Under Speed Warning Alarm for Magnetic Pickup sensor – Frequency Controlled Switch

This is an under-speed sensor module that provides an audible warning and signals output when the speed of a machine is below the set point. The module can be used in applications such as Engines, Machines, Sports machines, Fitness Equipment, Speed of the machine or engine can be...

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Frequency To Voltage Converter (Tachometer) – Variable Reluctance Magnetic Pickup to Voltage Converter

The circuit shown here is a frequency-to-voltage converter that can be used in many applications. This is a signal conditioner for Variable Reluctance Magnetic Pickup Sensor used in engines or machines to detect the speed by sensing gears' teeth. The input signal level is 20mV to 28V....

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