UJT Relaxation Oscillator Manufacturer,Supplier and Exporter in India
Product Code : EL-PET-1414
Jlab Export is a leading UJT Relaxation Oscillator Manufacturer,and suppliers in India
UJT Relaxation Oscillator (code EL-PET-1414) is a power electronics training board built around a 2N2646 unijunction transistor, for studying UJT characteristics, the UJT relaxation oscillator and its use as an SCR trigger circuit. JLab produces the board at its own works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Device under experiment | UJT (unijunction transistor) 2N2646 |
| Isolation transformer | 230 V AC at 100 mA; protects external instruments from damage if they are not isolated |
| DC supply | 20 V DC at 100 mA, IC-regulated, internally connected |
| Regulator circuit | Bridge rectifier and zener regulator |
| Frequency control | Potentiometer |
| Resistance and capacitance selection | Two band switches for selecting different values of resistance and capacitance |
| Pulse transformer | 1:1:1 |
| Mains controls | Mains on/off switch, fuse and jewel light |
| Mains supply | 230 V ±10%, 50 Hz AC |
| Patch cords | Stackable, 4 mm spring-loaded plugs, half a metre long |
| Terminals | Terminals/sockets on the panel for connections and observation of waveforms |
| Operating instructions | Detailed, giving object, theory, design procedures, report suggestions and book references |
| Other apparatus required | Digital multimeter, 3¾ digit; 0–30 V, 1 A IC-regulated power supply; dual trace cathode ray oscilloscope, 20 MHz (unearthed); variac, 0–230 V AC at 2 A |
| Weight | 3 kg (approx.) |
| Dimensions | W 340 x H 110 x D 210 |
| Packing | Corrugated box |
| Quality check | Each board is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-PET-1414 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the UJT Relaxation Oscillator Used For?
In a UJT relaxation oscillator a capacitor charges through a resistor until its voltage reaches the peak-point voltage of the UJT; the UJT then switches on and discharges the capacitor, producing a sharp pulse, and the cycle repeats at a rate set by the resistance and capacitance. Pulses of this kind, passed through a pulse transformer, are a classic way of triggering SCRs, so the experiment belongs to power electronics practicals in diploma and engineering courses and to BSc electronics labs. Experiments that can be performed:
- Zener diode as a voltage regulator
- Static emitter characteristics of the UJT on an oscilloscope
- Effect of the applied voltage on the peak-point and valley-point voltages and on the valley-point current
- Operation of the UJT relaxation oscillator and its use as an SCR trigger circuit
- Control of UJT trigger pulses with a shunt transistor
- Effect of changes in resistance and capacitance on the trigger pulse characteristics
- Relaxation oscillator configurations: type 1 (low output impedance), type 2 (moderate output impedance) and type 3 (high output impedance)
What to Specify When Ordering
- Other apparatus — the multimeter, regulated power supply, oscilloscope and variac are separate items; name the ones you need on the enquiry.
- Related boards — add SCR phase control or other power electronics trainers if the course uses them.
- Quantity — the number of boards for your lab.
Frequently Asked Questions
What other apparatus is needed with this board?
A 3¾-digit digital multimeter, a 0–30 V, 1 A IC-regulated power supply, a 20 MHz dual trace cathode ray oscilloscope used unearthed, and a 0–230 V AC, 2 A variac. These are separate items that can be quoted on the same enquiry.
Why does the board have an isolation transformer?
It separates the circuit from the mains, which protects external instruments such as the oscilloscope and meter from damage if they are not isolated themselves.
How is the oscillator frequency varied?
With the frequency-control potentiometer and the two band switches that select different resistance and capacitance values, since the charging time of the capacitor sets the pulse rate.
What are the type 1, 2 and 3 configurations?
Three versions of the relaxation oscillator that differ in output impedance — low for type 1, moderate for type 2 and high for type 3 — so the three can be compared on the same board.
What information is needed for an export quotation?
The number of boards, the destination country and port or city, the delivery terms you want (for example FOB or CIF), any packing or labelling needs and a tender reference if applicable.
Who manufactures the UJT Relaxation Oscillator?
Jain Laboratory Instruments Pvt Ltd (JLab) makes it in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, an Indian manufacturer of electronics and power electronics training boards, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The board is made in JLab’s own works rather than sourced from a trader, so institutes, dealers and importers buy from the maker, each board is visually inspected before dispatch, and repeat orders are handled by the same works. JLab exports worldwide and ships to buyers in every region — for example Honduras in Central America and the Caribbean, Guinea in West Africa, Angola in Central Africa, Uzbekistan in Central Asia and Malta in Southern Europe. For tender purchases, see the JLab lab tenders page.
Related Trainers and Instruments
- Unijunction Transistor — a board for the V-I characteristics of a UJT and its use as a relaxation oscillator, with variable regulated DC supplies and meters.
- SCR And AC Phase Control — resistance, RC and UJT trigger circuits for half-wave and full-wave SCR phase control.
- Silicon Controlled Rectifier — for SCR gate firing, anode current, holding current and phase firing characteristics.
- Dual Trace Oscilloscope — a DC to 20 MHz two-channel cathode ray oscilloscope, quoted separately.
See all Power Electronics Trainers or the full Electronics Lab Equipments range.
Request a Quote
Ask for a quotation with the Add To Cart enquiry button or through the contact page, listing the number of boards, the delivery destination and any of the other apparatus you want quoted with them.
Last updated: 22 October 2026
