Thyristor Alarms Manufacturer,Supplier and Exporter in India
Product Code : EL-PET-1422
Jlab Export is a leading Thyristor Alarms Manufacturer,and suppliers in India
Thyristor Alarms (code EL-PET-1422) is a power electronics training board with seven alarm experiments built around an SCR, including burglar, light-beam, temperature and water-level alarms. An internal 12 V audio alarm gives the audible output. It is one of the power electronics boards that Jain Laboratory Instruments Pvt Ltd (JLab) manufactures in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Experiments | Make-to-operate alarms; break-to-operate alarms; tamper-proof burglar alarm; alarm with delayed self-latching; alarm operated by water level; alarm sensitive to a light beam, using an LDR; alarm sensitive to temperature, using a thermistor |
| DC power supply | 12 V DC, internally connected, with fuse protection |
| Alarm sounder | Internal 12 V audio alarm |
| Push buttons | One for the push-to-break demonstration, one for the push-to-make demonstration |
| Alarm control | One PNP and two NPN transistors for electronic alarm control; SCR for alarm operation |
| Sensing amplifier | Two PNP transistors connected in differential amplifier mode for light and temperature sensing |
| Sensors | LDR for light sensing; thermistor for temperature sensing |
| Potentiometers | One for time-delay control; one for balancing the differential amplifier |
| Standby and reset | ON/OFF switch for the 12 V DC standby and reset |
| Other components | Adequate number of other electronic components |
| Mains controls | Mains ON/OFF switch, fuse and jewel light |
| Mains supply | 230 V ±10%, 50 Hz AC |
| Patch cords | Adequate number, stackable, 4 mm spring-loaded plugs, ½ metre long |
| Terminals | Terminals and sockets on the panel for connections and observation of waveforms |
| Operating instructions | Detailed, with object, theory, design procedures, report suggestions and book references |
| Weight | 3 kg (approx.) |
| Dimensions | W 340 × H 110 × D 210 |
| 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-1422 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Thyristor Alarms Board Used For?
An SCR suits alarm circuits because, on a DC supply, it stays on once its gate has been triggered, even after the trigger signal has gone. A brief event — a door contact opening or a light beam being interrupted — therefore keeps the alarm sounding until someone resets it. The board lets students see how one latching stage can serve quite different sensors and contact arrangements, which is the basis of practical intruder, temperature and level alarms. Alarm and sensor circuits of this kind are a regular part of industrial and power electronics practicals.
What to Specify When Ordering
- The number of boards required.
- Companion boards, such as the LDR-triggered SCR board or the SCR Ring Counter, if you are equipping a full bench of thyristor practicals.
- Any LDR or thermistor characteristics apparatus you want quoted for related sensor experiments.
- The delivery destination and delivery terms, plus the tender reference for a tender purchase.
Frequently Asked Questions
What is the difference between a make-to-operate and a break-to-operate alarm?
A make-to-operate alarm sounds when a normally open contact closes; a break-to-operate alarm sounds when a normally closed contact or wire loop is opened. A break-to-operate loop also trips if its wire is cut, a property used in tamper-resistant burglar alarms. The board has separate push buttons for the push-to-make and push-to-break demonstrations.
How do the light and temperature alarms sense a change?
An LDR’s resistance falls as the light on it increases, and a thermistor’s resistance changes with temperature. On this board the light and temperature sensing uses two PNP transistors connected as a differential amplifier, which has its own balance potentiometer.
How is the alarm reset once it has sounded?
With the ON/OFF switch for the 12 V DC standby and reset. Interrupting the current through a latched SCR turns it off, so the circuit is ready to be triggered again.
How is this board different from the Trigger a SCR by using a LDR board?
That board has a single object — triggering an SCR with an LDR — and works from an internal 6 V AC supply with potentiometers for intensity and sensitivity. Thyristor Alarms works from an internal 12 V DC supply and covers seven alarm experiments, of which the LDR light-beam alarm is one.
What should be included in an export enquiry?
The quantity of boards, the destination country and port or city, the delivery terms you want (for example FOB or CIF), packing or labelling instructions, and a tender reference where there is one.
Who manufactures the Thyristor Alarms board?
JLab, the trading name of Jain Laboratory Instruments Pvt Ltd, manufactures it at its works in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, an electronics trainer and laboratory equipment manufacturer in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. Each alarm board is wired and assembled at JLab’s own works, not bought in from a trader, so institutes, dealers and importers purchase it factory-direct; boards are inspected visually before dispatch, and repeat supplies are arranged by the manufacturer itself. JLab exports worldwide and ships to buyers in every region — for example Hungary in Eastern Europe, Latvia in Northern Europe, Lebanon in the Middle East, Mexico in North America and Madagascar in East Africa. Information for tender buyers is on the JLab lab tenders page.
Related Sensor and Thyristor Boards
- Trigger a SCR by using a LDR — a board for triggering an SCR from an LDR, with intensity and sensitivity controls.
- LDR Characteristics Apparatus — for plotting the current through an LDR against light intensity.
- Thermistor Characteristics Apparatus — for plotting a thermistor’s negative temperature coefficient of resistance, with an oven and thermometer.
- SCR Characteristics Apparatus — for plotting the anode current against anode–cathode voltage of an SCR.
- Thyristor Time Delay Relay — a UJT timer board for delayed turn-on and automatic turn-off of loads.
- SCR Ring Counter — three SCR stages that switch loads in sequence.
More boards are in the Power Electronics Trainers section and the full Electronics Lab Equipments range.
Request a Quote
Use the Add To Cart button on this page to send an enquiry, or write to JLab through the contact page; mention how many boards you need, the delivery address or port, and any related boards to add.
Last updated: 22 October 2026
