UJT Firing Circuit of SCR with Power Supply Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12911
Indian Lab Suppliers supplies the UJT Firing Circuit of SCR with Power Supply (Product ID: 12911) as part of its electronics engineering lab equipment range. It shows a UJT relaxation oscillator firing an SCR through a pulse transformer to control a lamp load.
Quick Answer
A bridge rectifier and zener diode give a clipped, synchronised supply for the UJT, so its timing capacitor restarts at the beginning of every half cycle and the gate pulses stay locked to the mains. A potentiometer changes the charging time and therefore the firing angle, and the lamp brightness changes with it. The pulse transformer isolates the SCR gate, and a 230 V, 200 mA isolation transformer protects external instruments. The board runs from 230 V ±10%, 50 Hz mains.
Key Specifications
| Parameter | Detail |
|---|---|
| Devices | UJT, SCR, zener diode |
| Coupling | Pulse transformer |
| Supply | Isolation transformer 230 V AC, 200 mA; bridge rectifier |
| Control | Firing-angle potentiometer |
| Load | Lamp |
| 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
A close variant of the Illumination Control using SCR with Power Supply (Product ID: 12913), and a next step after the Study of UJT and UJT Relaxation Oscillator with Power Supply (Product ID: 12879). The lamp circuit is at mains voltage. Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
Why is a zener diode used?
It clips the rectified supply so the UJT is reset and synchronised every half cycle.
How is the firing angle changed?
With the potentiometer that sets the UJT charging time.
What does the pulse transformer do?
It isolates the SCR gate from the trigger circuit.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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