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Circuit detectors and sensors based electronics projects

Circuit detectors and sensors based electronics projects like: metal detectors circuits, smoke detectors circuit, water detector circuit, light detector and other based sensors projects.

Metal detector circuit electronic project

This metal detector circuit electronic project is an very simple circuit that is based on common electronic parts .

Circuit Diagram: 
metal detector circuit electronic project

High power alarm driver electronic project

A very simple high power alarm driver electronic project can be designed using this circuit diagram . This high power alarm driver electronic project is based on low power SCR which trigger a high power SCR .

When a switch is opening (S2,S3,S4) or closing (S5,S6, S7) , either SCR1 or SCR2 triggers . This triggers SCR3 via D1 , D2 , and R5 . When the alarm is active the BZ1 buzzer will sound continuously , until the S1 reset switch is preset .
This electronic circuit require few electronic components and must be powered from a dc power supply circuit , that will provide an output voltage between 6 and 12 volt .

Circuit Diagram: 
High power alarm driver electronic project

Ultrasonic parking sonar electronic project

A very simple and useful ultrasonic parking sonar electronic circuit project can be designed using this schematic circuit . This ultrasonic parking sonar electronic circuit project has an adjustable detection range from 5 cm up to 1.5 meters and a detection angle of 5 degrees .
This ultrasonic parking circuit has a transmitter frequency of 45kHz and require a dc power supply circuit that can provide a output voltage between 10 and 15 volts at 16 mA output current (consumption current) .

The circuit is activated as soon as the gear is shifted in reverse (this is marked by a 'bip' tone) and will detect any obstacle within the range of the sensors, the detection distance ( sensitivity) being adjusted by means of the trimmer RV1. A distance of approx. 25 to 30cm from the backside of the car seems to be a value of practical use.
In case the buzzer cannot be heard clear enough, you can bring it closer to the driver by means of a 2 conductor extension cord.
Components required by this circuit are : R1 : 10M ,R2 : 22K,R3 ,R4: 27K ,R5 : 47 ,R6,R13 : 10K, R7,R8,R9,R10 : 15K ,R11,R12 : 1K , R14:270K , D1,D2,D3,D4: 1N4148, D5 : 1N4007 , C1,C2: 12pF , C3 : 22nF , C4, C7, C8: 10nF , C5 , C9: 100nF , C6 : 470µF , C10 : 10µF , C11 : 100µF , RV1 : 470K , IC1 : CD4060 , IC2 : CD4020 , IC3 : CD4068 , IC4 : CD4093 , IC5 : CD4049 , IC6 : TL074, T1: BC547, SENS 1 :MA40A5S , SENS 2 :MA40A5R .

Ultrasonic parking sonar electronic project

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