Study of UJT and UJT Relaxation Oscillator with Power Supply Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12879
Indian Lab Suppliers supplies the Study of UJT and UJT Relaxation Oscillator with Power Supply (Product ID: 12879) as part of its electronics engineering lab equipment range. It is a training board for the static characteristics of the unijunction transistor (UJT) and its use as a relaxation oscillator and SCR trigger.
Quick Answer
Students display the UJT emitter characteristic on an oscilloscope, see how the interbase voltage VBB shifts the peak-point and valley-point voltages and the valley current, and build a relaxation oscillator that fires an SCR through a 1:1:1 pulse transformer. Band switches change the timing resistance and capacitance, a potentiometer sets frequency, and a shunt transistor controls the trigger pulses, so the effect of timing and base-circuit resistors on the pulses can be measured. Three oscillator configurations (low, moderate and high output impedance) are compared, and a zener voltage-regulator exercise is included. The UJT is a 2N2646, fed from a built-in 20 V DC, 100 mA regulated supply.
Key Specifications
| Parameter | Detail |
|---|---|
| Device under test | UJT 2N2646 |
| Isolation transformer | 230 V AC, 100 mA |
| DC supply | 20 V DC, 100 mA, IC regulated |
| Other parts | Bridge rectifier, zener regulator, 1:1:1 pulse transformer |
| Controls | Frequency potentiometer; 2 band switches for R and C |
| Mains | 230 V ±10%, 50 Hz; ON/OFF switch, fuse and indicator lamp |
| Connections | 4 mm stackable patch cords, 0.5 m |
Where This Is Used
Used in power electronics labs before the UJT Firing Circuit of SCR with Power Supply (Product ID: 12911) and the Triggering Circuits for SCR with Power Supply (Product ID: 12895). The waveform experiments need an oscilloscope. Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
What is the peak-point voltage of a UJT?
The emitter voltage at which the UJT switches on; it rises with the interbase voltage.
Why is a pulse transformer used?
It isolates the SCR gate from the trigger circuit.
Which UJT is fitted?
A 2N2646.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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