PN Junction Diode
Product Code : SCL-EAE-11359
Quick answer: The PN Junction Diode apparatus is a panel-mounted physics trainer for studying the forward- and reverse-bias V-I characteristics of a semiconductor diode. Students vary the applied DC voltage, record the diode current and plot the characteristic curve to find the knee voltage. Lab Exports manufactures it in Delhi for schools, colleges and technical institutes.
Specifications
| Item | Specification |
|---|---|
| Experiment | Forward- and reverse-bias V-I characteristics of a PN junction diode |
| Layout | Panel-based: diode circuit, controls, terminals and measuring points on one panel |
| Category | Physics laboratory - electrical and electronics trainer |
| Intended users | Schools, colleges, technical institutes, physics teachers and electronics students |
| Make | Lab Exports |
For meter ranges, supply rating and the diode type fitted, email [email protected] with the house code.
How the PN junction diode experiment is done
A PN junction diode conducts easily when its anode is made positive with respect to its cathode (forward bias) and passes only a very small leakage current when the polarity is reversed (reverse bias). The PN Junction Diode apparatus lets students apply a controlled DC voltage to the diode, read the current at each step and plot the V-I characteristic curve that shows this one-way behaviour.
- Place the apparatus on a stable, dry bench and identify the diode terminals, measuring points and controls.
- Turn the voltage control to its minimum position before switching on.
- Wire the diode in forward bias and raise the voltage in small steps, noting the current at each step.
- Return the control to minimum, switch off and reverse the diode connections.
- Repeat the readings in reverse bias, then plot current against voltage for both directions.
In forward bias the current stays almost zero until the knee voltage is reached (roughly 0.6-0.7 V for a silicon diode, 0.2-0.3 V for germanium) and then rises steeply. In reverse bias only a tiny current flows. The slope of the forward curve gives the dynamic resistance of the diode, r = delta V / delta I.
Key features
- Covers both forward-bias and reverse-bias V-I characteristics on one unit
- Panel layout keeps the diode circuit, controls, terminals and measuring points together
- Gives paired voltage and current readings for plotting the characteristic curve
- Helps teachers explain anode, cathode, polarity and current direction step by step
- Suited to repeated classroom demonstrations and student practicals in physics and electronics laboratories
Documentation and supply
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 technical institutes 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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The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
What does the PN junction diode experiment show?
It shows that a diode conducts strongly in forward bias once the knee voltage is passed and blocks current almost completely in reverse bias. Students record voltage and current in both directions and plot the V-I characteristic curve.
Who is the PN Junction Diode apparatus intended for?
Schools, colleges, technical institutes, physics teachers and electronics students, for practicals on semiconductor devices and for teacher-led demonstrations of diode biasing.
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-11359 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-11359.
Request a quote
Email [email protected] with the house code SCL-EAE-11359 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.
