NPN Transistor Unit
Product Code : SCL-EAE-11265
Quick answer: The NPN Transistor Unit is used for common-emitter experiments with an NPN bipolar junction transistor. Students vary the base current, record collector current and collector-emitter voltage, plot input and output characteristics, work out the current gain and see the cutoff, active and saturation regions. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Semiconductor | NPN bipolar junction transistor |
| Terminals | Emitter, base and collector, marked on the panel |
| Configuration studied | Common emitter |
| Connections | Points for external power supplies, meters and accessories |
Transistor type number, ratings and supplied accessories are not listed on this page; email [email protected] with the house code for the current configuration.
How the NPN transistor experiment is done
In the common-emitter connection the emitter is shared by the input (base) and output (collector) circuits. A small base current IB controls a much larger collector current IC, and the ratio beta = delta IC / delta IB at fixed VCE is the current gain. With no base current the transistor is cut off; with a large base current it saturates and acts as a closed switch; in between it works in the active region used for amplification.
- Place the unit on a dry, non-conductive bench and identify the base, collector and emitter from the panel markings.
- Connect the base and collector supplies and meters according to the experiment circuit.
- Set both external supplies to zero before switching on.
- For input characteristics, keep VCE fixed and record IB as VBE is raised in small steps.
- For output characteristics, keep IB fixed and record IC as VCE is raised; repeat for several base currents.
The output curves rise steeply at low VCE and then flatten; the spacing between the curves for equal steps of IB gives the current gain.
Key features
- NPN bipolar junction transistor for common-emitter study
- Emitter, base and collector marked on the panel
- Supports input and output characteristic curves
- Current gain calculated from measured current changes
- Shows cutoff, active and saturation regions and switching action
- Connection points for external supplies and meters
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the NPN transistor unit at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities 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
How is the current gain of the transistor found?
Current gain beta = delta IC / delta IB at constant VCE. Measure the change in collector current for a known change in base current on the output characteristics.
Why are the supplies set to zero before switching on?
Starting from zero and raising the voltages gradually prevents sudden large currents that could damage the transistor or the meters.
What is the price of the NPN transistor unit?
Prices are not published on the website. Add the NPN transistor unit to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11265 and the quantity, to receive a quotation.
Does Lab Exports manufacture the NPN transistor unit?
Yes. Lab Exports manufactures the NPN transistor unit at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11265.
Request a quote
Email [email protected] with the house code SCL-EAE-11265 and the quantity, or add the NPN transistor unit to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
