PN Junction Diode
Product Code : SCL-EAE-11361
Quick answer: The PN Junction Diode apparatus (SCL-EAE-11361) is an educational unit for plotting the forward- and reverse-bias V-I characteristics of a semiconductor diode. A controlled DC voltage is applied, the current is recorded at each step and the knee voltage is read from the graph. Lab Exports manufactures it in Delhi for schools, colleges and polytechnics.
Specifications
| Item | Specification |
|---|---|
| Product code | SCL-EAE-11361 |
| Experiment | Forward- and reverse-bias V-I characteristics of a PN junction diode |
| Category | Physics laboratory - electrical and electronics apparatus |
| Intended users | Schools, colleges, polytechnics, technical institutes, teachers and electronics students |
| Make | Lab Exports |
Voltage range, current range, meter arrangement and power requirement are given with the quotation; email [email protected] with the house code.
How the diode characteristic is measured
Where the p-type and n-type regions of a PN junction meet, a depletion layer forms and sets up a barrier potential. Forward bias narrows this layer until current flows freely; reverse bias widens it so that only a minute minority-carrier current remains. The PN Junction Diode apparatus turns this theory into a measured result: a controlled DC voltage is applied to the diode and the matching current is logged at each setting.
- Position the unit on a steady, dry bench and find the diode terminals, measuring points and adjustment control.
- Set the adjustable supply to minimum, then connect the diode in forward bias as per the supplied circuit diagram.
- Raise the voltage gradually, logging the current against each voltage value.
- Return the supply to minimum and switch off before reconnecting the diode in reverse bias.
- Log the reverse-bias readings and draw the complete V-I curve on graph paper.
From the graph, students read off the cut-in (knee) voltage, compare conduction in the two directions and discuss why diodes are used as rectifiers in power supplies.
Key features
- Educational unit for the forward- and reverse-bias V-I characteristics of a PN junction diode
- Diode connections and measuring points kept accessible on one unit
- Paired voltage and current readings ready for graphical analysis
- Links junction theory - depletion layer, barrier potential, biasing - to observed results
- For supervised practicals in school, college, polytechnic and introductory electronics laboratories
Documentation and supply
A circuit diagram for the diode connections is supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the PN Junction Diode apparatus at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and polytechnics in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
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- MO65 Desk Stand Meter (SCL-EAE-11358)
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- MR80 Desk Stand Meter (SCL-EAE-11356)
The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
What is the knee voltage of a PN junction diode?
It is the forward voltage at which the diode current starts to rise sharply. For a silicon diode it is typically about 0.6-0.7 V and for a germanium diode about 0.2-0.3 V; students locate it on the forward V-I curve plotted with this apparatus.
Which lessons does the PN Junction Diode apparatus support?
Semiconductor physics and introductory electronics: diode polarity, forward and reverse bias, current direction, the knee region and the use of diodes in rectification.
What is the price of the PN Junction Diode apparatus?
Prices are not published on the website. Add the PN Junction Diode apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11361 and the quantity, to receive a quotation.
Does Lab Exports manufacture the PN Junction Diode apparatus?
Yes. Lab Exports manufactures the PN Junction Diode apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11361.
Request a quote
Email [email protected] with the house code SCL-EAE-11361 and the quantity, or add the PN Junction Diode apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
