Photo Transistor Characteristics Apparatus Manufacturer,Supplier and Exporter in India

Product Code : EL-OED-1058
Jlab Export is a leading Photo Transistor Characteristics Apparatus Manufacturer,and suppliers in India

Photo Transistor Characteristics Apparatus (code EL-OED-1058) is a bench unit for plotting a phototransistor’s current against light intensity at different voltages in electronics practicals. The phototransistor is mounted on the panel with a 0–10 V DC, 50 mA power supply, two meters for voltage and current, and a light source, and its connections are brought out to terminals. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.

Specifications

What Is the Phototransistor Apparatus Used For?

A phototransistor is a transistor whose base region is exposed to light. Light reaching the base–collector junction produces a small photocurrent that acts like a base current, and the transistor’s gain multiplies it, so a modest change in light gives a large change in collector current. On this apparatus students fix the voltage across the phototransistor, change the light from the light source and read the current, then repeat at other voltages. The result is a family of curves much like a normal transistor’s output characteristics, with light intensity taking the place of base current: the current rises steeply with light and, beyond a low knee voltage, changes only gently with voltage.

It is a standard practical in B.Sc. electronics and physics, engineering and polytechnic courses on optoelectronic devices, and ITI electronics workshops. The phototransistor’s high sensitivity is why it is used in slotted optical switches, object counters, shaft encoders and the receiving side of optocouplers. Keep the room light constant while recording, change the light in even steps, and turn the supply down before changing connections.

What to Specify When Ordering

• Quantity — the minimum order is 10 units, normally one per bench or student group.
• Light source arrangement — the listing does not describe how the light level is set or measured, so ask for it to be confirmed in the quotation.
• Mains supply — state your lab’s voltage and plug type for the power supply.
• Leads and spare phototransistors — add them to the enquiry if your benches need them.

Frequently Asked Questions

What does the phototransistor apparatus measure?
The current through a phototransistor at different light intensities and voltages. Students plot current against light intensity for each voltage to build up the device’s characteristic curves.

What power supply and meters does it have?
A DC power supply of 0–10 V DC at 50 mA and two meters, one for voltage and one for current. The phototransistor is on the panel, a light source is included, and the connections are brought out to terminals.

Why does a phototransistor give more current than a photodiode?
Because it amplifies its own photocurrent. The light-generated current flows as base current and is multiplied by the transistor’s gain, so the collector current is many times larger, at the cost of a slower response.

How is it different from the Characteristics of Opto Electronic Devices Kit?
This unit is dedicated to the phototransistor. The kit, listed separately, puts a phototransistor, a photodiode and an LED on one panel with a 0–3 V DC regulated supply, for labs that want a single combined trainer.

What should an export quotation request include?
Quantity, destination country and port or city, delivery terms such as FOB or CIF, packing or labelling requirements, and a tender reference if applicable.

Who manufactures this apparatus?
Jain Laboratory Instruments Pvt Ltd (JLab) builds it at its works in Ambala, Haryana, India, and quotes for it directly as the manufacturer.

OEM Manufacturer

JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a manufacturer of electronics trainers and physics lab equipment in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The panel, supply and meters of this apparatus are made up at JLab’s own works rather than bought in from a trader, so institutes, colleges, dealers and importers buy factory-direct, each unit is visually inspected before dispatch, and repeat orders and spares are handled by the maker. JLab exports worldwide and ships to buyers in every region — for example Hungary in Eastern Europe, Rwanda in East Africa, Ghana in West Africa, Tajikistan in Central Asia and Kuwait in the Middle East. See the JLab lab tenders page for tender purchases.

Related Opto-Electronics Trainers

• Photodiode Characteristics Apparatus — the same current-versus-light experiment for a photodiode.
• Characteristics of Opto Electronic Devices Kit — phototransistor, photodiode and LED on one panel.
• LED Characteristics Apparatus — the V–I characteristics of the light emitter used with phototransistors in optical switches.
• Photoelectric Relay Apparatus — a light sensor switching a relay, the application side of light detection.

See every unit in the OPTO Electronic Devices range or the wider Scientific Instrument range.

Request a Quote

Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), your mains voltage, any leads or spare phototransistors and the delivery location through the contact page.

Last updated: 9 October 2026