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6 in 1 Gift Box Save Rs. 101.00
Rs. 700.00
Rs. 599.00

6 in 1 Gift Box

6 in 1 Gift Box

by KNS Pvt Ltd
Save Rs. 101.00
Rs. 700.00
Rs. 599.00

The Gift box contains 5 electronic project kits and a soldering kit to make them. Gift Box has one each of the following kits;

  • Musical Touch Bell
  • Musical Door Bell
  • Water Level Indicator
  • Burglar Alarm
  • Magic Eye
  • Soldering Kit

Learning from the kit

Things you can learn,

  • Application of the melody generator IC BT66 (or UM66).
  • Application of PNP and NPN type transistors for switching purposes.
  • Application and implementation of the NE555 timer IC in the astable mode.
  • Principle involving the use and function of LDRs (Light Dependent Resistors) and their application.
  • Hands on experience of soldering different components.

Product Description

The 6 in 1 gift box is a complete kit for those keen on developing quality electronic projects. It contains 5 projects which test your skills at a different level. It also contains a soldering kit required to complete this kit. This box opens up a great opportunity for learning.

Musical Touch Bell: The Musical Touch Bell implemented here can be operated by just bridging the gap between two touch plates by one’s fingertips and requires minimal power consumption. The circuit generates a pleasant musical tone through a melody generator IC, as long as the touch plates are in contact.

Musical Door Bell: Most conventional doorbells available in the market generate alarm for a specific time duration which cannot be reprogrammed or controlled. This can be annoying when a person has answered the door immediately. The musical doorbell (with memory) implemented here is a simple doorbell whose ringing duration can be varied easily. The circuit generates a pleasant musical tone for a preset time duration after the toggle switch is pressed.

Water Level Indicator: The purpose of a water level indicator is to caution when a water tank has been filled up to a particular level. This circuit exploits the simple fact that water is a good conductor of electricity. The system is capable of indicating the water level in two ways- visual (by the means of an LED) and audible (by the means of a sound generated by a piezoelectric buzzer).

Burglar Alarm: The burglar alarm implemented here is a simple circuit that sounds an alarm on detecting intrusion. The system is implemented by installing a simple sensing loop, which is basically a thin copper wire. This way, the loop is both invisible and brittle enough to break easily and initiate the alarm mechanism. At the time of an intrusion, the loop breaks causing the loudspeaker to generate a continuous and loud alarm sound.

Magic Eye: It can be used for a variety of applications like a burglar alarm, smoke detector or an automatic guest indicator. All these applications make use of the Light Dependent Resistor (LDR) which is installed and implemented differently in each case.

Soldering Kit-Contains basic tools for soldering.

Automatic Night Lamp Dimmer with Morning Alarm Save Rs. 75.00

Automatic Night Lamp Dimmer with Morning Alarm

by KNS Pvt Ltd
Save Rs. 75.00
Rs. 300.00
Rs. 225.00

This automatic night lamp serves a dual purpose, depending on the intensity of light rays detected. The circuit is capable of automatically switching ‘ON’ a white LED on detecting darkness, to act as a night lamp. Conversely, it can also sense daylight and play a melodious tune as a morning alarm. The circuit operates on AC supply and the circuit also provides for battery backup in case of power failure.

No. of ICs used: 3

Learning from this project

  • Application of NE555 timer IC in monostable mode.
  • Concepts related to the working of light dependent resistors.
  • Implementation of bridge rectifier circuit for AC to DC conversions.
  • Application of the music generator IC UM66.

Product Description

This project builds an automatic lamp with night dimmer and morning alarm. It can set the ambient light of your room and also wake you up when the sun rises.

Working

The automatic night lamp dimmer with morning alarm is powered by a standard 0-9V transformer. Diodes (D1-D4) rectify the AC voltage and the resulting DC voltage is smoothed by a capacitor (C1). Voltage regulator IC (7806) provides regulated 6V DC supply to the circuit while battery backup is also provided to power the circuit when mains fails. When mains supply is available, a 9V rechargeable battery charges via a diode (D5) and a resistor (R1) with a reasonably constant current. In the event of a power failure, the battery automatically takes up the load without delay.

The circuit uses light dependent resistors (or LDR) for sensing ambient light conditions. Typically, an LDR offers high resistance in darkness, which reduces to a minimum when bright light is incident on it. In this automatic night lamp dimmer circuit, one LDR (LDR1) detects darkness while another LDR (LDR2) detects light in the morning.

The circuit is designed around the single timer IC NE555 (IC2), which is configured to work in the monostable mode in the circuit. IC2 is activated by a low pulse applied to its trigger input (pin 2). Once triggered, the output pin (pin 3) of IC2 goes high and remains in that position until IC2 is triggered again by the input at pin 2. When LDR1 is illuminated by the ambient light, its resistance falls to a minimum and pin 2 (trigger input) of IC2 remains at a positive potential. This causes the output (pin 3) of IC2 to go low and hence, the white LED remains off.

In absolute darkness, the LDR has a resistance in excess of 280-kilo ohms. So, when the resistance of LDR1 increases, a short pulse is applied to trigger input (pin2) of IC2 via a resistor (R2).

This triggers the monostable mode of operation and the output pin of the NE555 (IC2) goes high, causing the white LED to glow. A low-value capacitor (C2) maintains the monostable for continuous operation, eliminating the timer effect. By increasing the value of C2, the ‘ON’ time of the white LED can be adjusted. LDR2 and associated components generate the morning alarm at dawn. LDR2 detects the ambient light in the room at sunrise and its resistance gradually falls. This makes a transistor (T1) to start conducting. When T1 conducts, a melody-generator IC UM66 (IC3) gets supply voltage from the emitter of T1 and it starts producing the melody. A single-transistor amplifier (T2) amplifies the musical tone generated by IC3.

Click To View Circuit Diagram

Click here to Download PDF

Speed Checker For Highways

Speed Checker For Highways

by KNS Pvt Ltd
Rs. 650.00

Summary

While driving on highways, motorists tend to exceed the maximum permissible speed limit set by the traffic department. The speed checker implemented here is a low cost solution which will allow the traffic policemen to monitor speeds. The Speed Checker for Highways displays a digital reading corresponding to the vehicle’s speed and also sounds an alarm if the vehicle exceeds the permissible speed for the highway.


The speed-sensing is done by the means of two laser transmitter-LDR sensor pairs. These are installed on the highway 100 meters apart, with the transmitter and the LDR sensor of each pair on the opposite sides of the road. The system displays the time taken by the vehicle to cross this 100m distance from one pair to the other with a resolution of 0.01 second. The speed of the vehicle can be calculated from the simple speed-time-distance equation.

Learning

*Application of the NE555 timer in the monostable and astable mode.

*Application of the decade counter/7-segment decoder IC CD4026.

Product Description

The Speed Checker Kit for Highways is a simple kit based on 555 Timer IC, NAND gate inverter, Decade counter and 7 segment display to calculate the speed of vehicles , plying on the road.


Working


The Speed Checker for Highways implemented here assumes that the maximum permissible speed for highways is either 40Kmph or 60Kmph as per the traffic rule. For 40kmph limit the time period is set for 9 seconds using preset VR1, while for 60kmph limit the time period is set for 6 seconds using preset VR2. Slide switch S1 is used to select the time period as per the speed limit i.e. either 40Kmph or 60Kmph. The junction of LDR1 and resistor R1 is coupled to pin2 of IC1. Normally, light from the laser keeps falling on the LDR sensor continuously and thus the LDR offers a low resistance and pin2 of IC1 is high.


Whenever light falling on the LDR is interrupted by any vehicle, the LDR resistance goes high and hence pin 2 of IC1 goes low to trigger the monostable. As a result, output pin3 goes high for the preset period, either 9 or 6 seconds, and LED1 glows to indicate it. Reset pin 4 is controlled by the output of NAND gate N3 at power-on or whenever reset switch S2 is pushed. For IC2, the monostable is triggered in the same way as IC1 when the vehicle intersects the laser beam incident on LDR2 to generate a small pulse for stopping the count and for use in the speed detection. LED2 glows for the duration for which pin 3 of IC2 is high.


The outputs of IC1 and IC2 are fed to input pins 2 and 1 of NAND gate N1, respectively. When the outputs of IC1 and IC2 go high simultaneously i.e. the vehicle has crossed the preset speed limit, output pin 3 of gate N1 goes low to trigger mono-stable timer IC3. The output of IC3 is used for driving piezoelectric buzzer PZ1, which alerts the operator of speed-limit violation.


Resistor R9 and capacitor C5 decide the time period for which the piezoelectric buzzer sounds. The output of IC1 triggers the bistable (IC4) through gate N2 at the leading edge of the count-start pulse. When pin2 of IC4 goes low, the high output at its pin 3 enables astable clock generator IC5. Since the count-stop pulse output of IC2 is connected to pin6 of IC4 via diode D1, it resets clock generator IC5. IC5 can also be reset via diode D2 at power-on as well as when reset switch S2 is pressed.

Click To View Circuit Diagram

 

 

Click here to Download PDF


 

 

Smart Emergency Light Save Rs. 75.00
Rs. 300.00
Rs. 225.00

Smart Emergency Light

Smart Emergency Light

by KNS Pvt Ltd
Save Rs. 75.00
Rs. 300.00
Rs. 225.00

Summary

Now you need not fear dark nights when power breaks down. Here’s a white LEDbased Emergency light that automatically turns on when the mains power supply fails.

Learning

Things which you can learn:

*Application of NE555 inastable mode.
*Application of LDR in light and dark.
*Application of bridge rectifier.

Product Description

Build an Emergency light which will automatically switch on when the power fails, thus obviating the need to search the light and switch it on manually!!

Working


The switching circuit is built around an NE555 timer (IC1), which is wired in monostable mode. When a low voltage is applied at trigger pin 2 of IC1, the timer activates and its output pin 3 goes high. It remains in that state until IC1 is triggered again at its pin 2. Light-dependant resistor LDR1 is connected between the positive supply of the battery and trigger pin 2 of IC1. Resistor R3 is connected between pin 2 of IC1 and ground. The resistance value of LDR1 remains high in the dark (at night) and low in ambient light (in daytime). This phenomenon is utilised to control the switching circuit.

The working of the circuit is simple. In daytime, when ambient light falls on LDR1, its resistance decreases to make trigger pin 2 of IC1 high. As a result, output pin 3 goes low and the LEDs(LED1 through LED7) remain off. At night (in the dark), the resistance of LDR1 increases and a low voltage is applied to trigger pin 2 of IC1. This activates the monostable and its output goes high to make all the LEDs glow.

 

Click here to Download PDF

 

Power Failure And Resumption Alarm Save Rs. 100.00

Power Failure And Resumption Alarm

by KNS Pvt Ltd
Save Rs. 100.00
Rs. 300.00
Rs. 200.00

Summary

The Power Failure and Resumption Alarm circuit sounds an alarm whenever AC supply mains fails or resumes. The circuit gives an audio-visual indication of the failure and resumption of mains power through a bi-colour LED and a piezoelectric buzzer. No. of IC used: 3

Learning

Thiings Which you can learn:
*Application of the LM556 dual timer IC in the astable and monostable mode.
*Application of PNP and NPN transistors.
*Concept and working of bi-colour LEDs.

Product Description

A simple circuit which provides Audio Visual Indication when the AC supply resumes/fails.
This is important as when the users gets informed about the power failure, he/she can judiciously use the supply from the inverter so that they are not affected due to excessive drain of battery.The heart of the Power Failure and Resumption Alarm circuit is the dual timer IC LM556. When mains is present, the bicolour LED (LED1) glows in green colour while when the mains fails it turns red.

Working:

When mains is present, the PNP transistor BC558 (T1) is in the cut-off state and therefore the bicolour LED glows in green colour. When power fails, PNP transistor T1 starts conducting and bicolour LED glows in red colour. Due to non-availability of Vcc voltage at pin 14 of LM556 (IC2), its output pin (Pin9) remains low and NPN transistor BC548 (T3) does not conduct.

However, a 4700µF capacitor (C7) holds an adequate charge and hence PNP transistor BC557 (T4) conducts and the piezoelectric buzzer (PZ1) sounds continuously for approx. eleven seconds until capacitor C7 discharges completely. When power resumes, bicolour LED glows in green colour and the buzzer beeps for approx. 14 secs.

IC LM556 outputs frequencies in the form of pulses at its pin 9. These pulses are coupled to the NPN transistor BC548 (T3), which conducts and cuts off depending on the output at pin 9 of IC2. A Red LED (LED2) is connected to pin 9 via a 270-ohm current-limiting resistor (R7) to indicate power resumption.

 

Click here to Download PDF

 

Intruder Alarm Save Rs. 75.00
Rs. 250.00
Rs. 175.00

Intruder Alarm

Intruder Alarm

by KNS Pvt Ltd
Save Rs. 75.00
Rs. 250.00
Rs. 175.00

Summary

The Intruder Alarm automatically activates a loud alarm whenever any unauthorized entry is attempted. Unlike other alarms, the Intruder Alarm circuitry does not need replacement of a broken loop. The alarm can be turned OFF just by the simple flick of a switch. The unit power on indication by LED is also provided here for better monitoring.
Build yourself a simple intruder alarm circuit to keep the thieves at bay!! No. of ICs used: 2

Learning

Things which you will Learn :
*Learn how to use LDR sensor.
*Application of basic gates and flip-flop and hex inverters.

Product Description

The Intruder Alarm circuit should be typically fitted to the door of your house, to sound an alarm when anyone pushes the door. This way it alarms you against thieves or intruders. The circuit primarily comprises a transmitter and receiver pair. The transmitter is fitted onto the inside of the door frame while the receiver is fitted to the door panel.

Working:

The transmitter section consists of a laser diode which is powered by a 9V battery. When the switch (S1) in the transmitter section is closed, the laser diode glows. Closing switch (S2) provides power supply to the receiver section. Light falling from the laser diode on the light-dependent resistor (LDR) in the receiver section provides base current to transistor T1 and it starts conducting. This grounds the base of the transistor (T2), so it doesn’t conduct and the alarm remains off. When somebody pushes the door, light incident on the LDR is interrupted and the transistor (T1) stops conducting since the LDR offers a high resistance in the absence of light. Transistor T2 receives base current and starts conducting. The pulse from the emitter of transistor T2 is connected to the inputs of AND gate N1 (IC1). The high output of AND gate is connected to a JK flip-flop (IC2) that works as a latch. As a result, output pin 12 (Q1) of IC2 goes high to cause conduction of transistor T3 and consequent sounding of the alarm. The alarm can be turned off by switch S2.

Note: While testing at EFY Lab, a laser torch was used in place of the transmitter.

Click To View Circuit Diagram

 

Click here to Download PDF

Arduino Starter Kit Save Rs. 201.00
Rs. 2,000.00
Rs. 1,799.00

Arduino Starter Kit

Sensor Based Solar Tracking System Save Rs. 500.00
Rs. 4,000.00
Rs. 3,500.00

Sensor Based Solar Tracking System

Sensor Based Solar Tracking System

by KNS Pvt Ltd
Save Rs. 500.00
Rs. 4,000.00
Rs. 3,500.00

Product Description

This is a power generating method from sunlight.This method of power generation is simple and is taken from a natural resource. This needs only maximum sunlight to generate power. This project helps for power generation by setting the equipment to get maximum sunlight automatically. This system is tracking for maximum intensity of light. When there is a decrease in intensity of light, this system automatically changes its direction to get the maximum intensity of light.

Here we are using two sensors in two directions to sense the direction of maximum intensity of light. The difference between the outputs of the sensors is given to the microcontroller unit.

Here we are using the microcontroller for tracking and generating power from sunlight. It will process the input voltage from the comparison circuit and control the direction in which the motor has to be rotated so that it will receive the maximum intensity of light from the sun.

The power generated from this process is then stored in a lead acid battery and is made to charge an emergency light and is made to glow during night

Brand: HBeonLabs, Product assembled by HBeonLabs.

 

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