Sensors electronic circuits design projects

Sensors electronic circuits design projects and schematics

Simple lie detector circuit design electronic project

A simple lie detector that is based on well-known principle of Biofeedback can be designed using this electronic circuit diagram.
This lie detector circuit described eally give two readings: one for the difficult questions and one show subject general emotional state. As electrodes can be used two flexible wires, uninsulated wrapped around the fingers or wrist.

Circuit Diagram: 
Simple lie detector circuit design electronic project

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SN16889 battery voltage indicator circuit design electronic project

This battery voltage indicator electronic project is designed using linear voltage indicator SN16889 (manufactured by Texas Instruments) or MC16889 (manufactured by Motorola). The circuit below allows lighting, depending on input voltage of one or more LEDs. Maximum voltage at which all LEDs light is adjusted using potentiometer P1 to 15 volts.

Circuit Diagram: 
SN16889 battery voltage indicator circuit design electronic project

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Drop voltage indicator using 741 op amp

A indicator of drop voltage can be designed using electronic diagram below. This indicator shows the drop voltage or disturbing impulses of any existing network using a LED which will light.
This circuit can be powered with a DC voltage between 5 and 12 volts.

Circuit Diagram: 
Drop voltage indicator using 741 op amp circuit schematic

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