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Zener Diode Tester

Zener Diode Tester

by KNS Pvt Ltd
Rs. 200.00

Summary

Zener Diodes are a very important concept when it comes to the voltage regulator. To effectively control voltage it is essential that the diodes work perfectly. So we bring you a Zener Diode Tester kit which can be used to check zener diodes of 3.3V to 18V. The breakdown voltage of the unknown zener diode is indicated on the pre-calibrated dial of the potentiometer VR1. The tester can also identify the polarity of zener diodes. No. of ICs used: None

Learning

Things which you can learn:

*Concepts related to zener diodes and their application.
*Application of transistor for switching purposes.

Product Description

The power supply section of the Zener Diode Tester provides approx. 20V DC stabilized voltage to the sensor section. The sensor circuit comprises two resistors (R2 and R30, a potentiometer (VR1), a red LED and an NPN transistor BC547 (T2).

Working:

When the linear potentiometer VR1 is adjusted such that the voltage at its wiper arm (red crocodile clip) exceeds the breakdown voltage of the zener diode, the zener diode
conducts and applies the bias voltage at the base of transistor T2, which causes the red LED to light up. When the voltage at the wiper arm (red clip) is less than the breakdown voltage, the zener diode does not conduct and red LED does not glow. For calibration of the zener diode tester, initially, the pointer knob of VR1 is set towards the zero-resistance position. Short red clip of the potentiometer and black clip of the transistor and switch on the tester. The pointer knob of potentiometer VR1 is slowly rotated in a clockwise direction until LED just starts to glow.

This setting of the knob is marked on the paper dial as 0V. Now a zener diode of a known value (for example, 3.3V) is connected between both the clips (red clip to the cathode and black clip to the anode of the zener diode). The knob of potentiometer VR1 is further rotated in the clockwise direction until the red LED just starts to glow. This setting of the knob is marked on the paper dial as 3.3V. Likewise, the dial of potentiometer VR1 is calibrated for other values of zener diodes by connecting known zener diodes to the tester.

For testing an unknown zener diode, it is connected across the clips in correct polarity
and the knob of potentiometer VR1 is rotated until red LED1 just starts to glow. The
voltage shown by the pointer knob on the dial at this setting is the breakdown voltage
value of the zener diode under test. If the zener diode is connected in reverse polarity (red clip to the anode and black clip to the cathode), the LED glows brightly at all settings of the knob above the zero reading, indicating that the zener diode is wrongly connected. The anode and cathode terminals of rectifier diodes can also be identified in this way.


EFY Note: It is not recommended to touch the clips while testing.

 

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Intelligent Metro Train Save Rs. 600.00
Rs. 6,000.00
Rs. 5,400.00

Intelligent Metro Train

Intelligent Metro Train

by KNS Pvt Ltd
Save Rs. 600.00
Rs. 6,000.00
Rs. 5,400.00

Summary

Future era train which has very advanced features.

Product Description

This project is designed so that students can understand the technology used in the now a day’s drive less metro train which is used in most of the developed countries like Germany, France, and Japan etc. These trains are equipped with the CPU, which controls the train. The train is programmed for the specific path. Every station on the path is defined; stoppage timing of the train and distance between the two stations is predefined. This is a very wonderful project to control the working of the train without a driver.

Brand: HBeonLabs, Product assembled by HBeonLabs

 

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Solar Charged Emergency Light And Fan Save Rs. 1,000.00
Rs. 4,000.00
Rs. 3,000.00

Solar Charged Emergency Light And Fan

Solar Charged Emergency Light And Fan

by KNS Pvt Ltd
Save Rs. 1,000.00
Rs. 4,000.00
Rs. 3,000.00

Summary

This is a circuit which uses battery, solar panel, mains power supply as a power source. At night it uses a rechargeable battery to power light and fan and in the morning solar energy is used to recharge the battery as well as to power the fan or light. Suppose the battery is not charged due to bad weather conditions then we can use mains supply to charge the battery.

Learning

Things which you can learn:
1. Extraction of Energy from solar panels
2. Solar efficiency
3.Step down transformer -for voltage reduction
4. Concepts and implementation of rotary switch

Product Description

Build yourself a cool hybrid emergency light with Fan, which can be charged by both AC and Solar Energy. Get to know how this kit uses the solar energy efficiently in charging the battery


Emergency lights do not work long enough as their batteries are not charged fully due to the power cuts. During night the situation is even worse as it becomes impossible to sleep when the fan also stops working. Here is a circuit for solar-charged emergency light that can also be used to run a small DC fan. It can help in resolving the problem of uncharged batteries by providing dual charging option. Its battery gets charged by a solar panel during the day, but when it is cloudy, or at night, it can be charged using the mains power supply.

Click To View Circuit Diagram

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Electronic Circuit Breaker Save Rs. 500.00
Rs. 5,000.00
Rs. 4,500.00

Electronic Circuit Breaker

Electronic Circuit Breaker

by KNS Pvt Ltd
Save Rs. 500.00
Rs. 5,000.00
Rs. 4,500.00

A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation.

Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.

Brand: HBeonLabs, Product assembled by HBeonLabs

 

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