Warning Light and Marker Light Circuit Diagram

This is a project of simple circuit of Warning Light and Marker Light Circuit Diagram. In this circuit a flashing light of high brightness and short duty cycle is often desired to provide maximum visibility and battery life. This necessitates using an output transistor, which can supply the cold filament surge current of the lamp while maintaining a low saturation voltage. The oscillation period and flash duration are determined in the feedback loop, while the use of a photo transistor sensor minimizes sensitivity variations.

Warning Light and Marker Light Circuit Diagram

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Simple Proximity Detector Sensor Circuit Diagram

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. This simple circuit is actuated by an increase in capacitance between a sensing electrode and the ground side of the line. The sensitivity can be adjusted to switch when a human body is within inches of the insulated plate used as the sensing electrode. Thus, sensitivity is adjusted with the 1 meg ohm potentiometer which determines the anode voltage level prior to clamping This sensitivity will be proportional to the area of the surface opposing each other.

Simple Proximity Detector Sensor Circuit Diagram

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Simple Metal Detector

An NE602 acts as a heterodyne detector and Ql as a sense oscillator. When Ll is brought near metal, it causes a charge in loop inductance, shifting the resonant frequency of Ll C6/C7. Ll is 5 turns #20 wire on a 9` diameter wood or plastic form.

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Simple Light Sensor Alarm circuit with NE555

Occurring this circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 stable multivariate was used here which sent signal a tone of about 1kHz upon detecting light.The sensor when exposed by light completes the circuit and makes the 555 oscillate at about 1kHz with transistor to drive current.

The sensor is also shown in the circuit diagram. It has to placed making an angle of about 30 – 45 degrees to the ground.

 Sensitivity can be adjust with P1.
 This makes the sun light to flow through it to the ground and prevents the alarm from going on due to the stored light on the sensor

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Simple Light Sensor Alarm circuit with NE555

This circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 astable multivibrator was used here which sent signal a tone of about 1kHz upon detecting light.The sensor when exposed by light completes the circuit and makes the 555 oscillate at about 1kHz with transistor to drive current.

The sensor is also shown in the circuit diagram. It has to placed making an angle of about 30 – 45 degrees to the ground.

Sensitivity can be adjust with P1.  This makes the sun light to flow through it to the ground and prevents the alarm from going on due to the stored light on the sensor.

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Simple Fluid Level Sensor Circuit

For all electrically conductive Fluid or liquid level measurement, this single-chip circuit is very compact and simple. This circuit is a voltage level sensor encouraged the AC bias supply for the sensor to prevent the electrolysis of the probes used.

This AC excitation, the sensor has a longer life. This circuit is useful for a wide range of water or liquid level measurement and control, heat registers, vending machines, washing machines, water softener, irrigation, reservoir, tank, aquarium or  pumps.

Many types of liquids are electrically conductive and can track by using this level sensor: City / groundwater, seawater, Chopper solution, weak acid, weak base, household ammonia, water and glycol mixture, wet soil, coffee and juices.

Remember that most of the fuel is not electrically conductive, so that this circuit can be used as a fuel level sensor assembly / detector. Some other non-conductive liquid are: pure water, gasoline, oil, brake fluid, alcohol, ethylene glycol, paraffin, dry soil, and whiskey. The following figure shows the schematic of the circuit.

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Simple Proximity Detector & Alarm Circuit

This is a simple proximity switches with IC 4049th The IC4049 is a bipolar monolithic integrated circuit for use in metal-detection system / proximity sensing applications IC4049 includes an oscillator constituted by an external parallel resonant tank circuit and a feedback resistor connected 2-5 The internal oscillator operates near the resonant frequency of the tank is brought circuit.As a metal object near the coil begins to decrease the amplitude of the voltage across the tank gradually.

If the envelope of the oscillation a certain level, the greater the resistance the greater the travel distance.Detection-point range with a high Q coil.Maximum possible range can be achieved with a well extended to 1-inch drive circuit. Only So this circuit, the tuning circuit to a certain range.

For making it easy to a metal coil at the desired distance (1 inch) square and adjust the resistance, C1 and C2 (make Pin2 or 5) one of the outputs in the state change.

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