Thyristor Alarms with Power Supply (C.R.) Manufacturer,Supplier and Exporter in India
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Product Code : SCL-EELE-12887
Indian Lab Suppliers supplies the Thyristor Alarms with Power Supply (C.R.) (Product ID: 12887) as part of its electronics engineering lab equipment range. It is a self-contained board for seven SCR-based alarm circuits, from simple make and break contacts to light, temperature and water-level sensing.
Quick Answer
An SCR latches the internal 12 V audio alarm once triggered, which is why it suits alarm circuits: a short signal keeps the alarm on until reset. Students build make-to-operate and break-to-operate alarms with the two push buttons, a tamper-proof burglar alarm, an alarm with delayed self-latching, and a water-level alarm. Two PNP transistors in a differential amplifier, with a balance potentiometer, sense light through an LDR and temperature through a thermistor; one PNP and two NPN transistors handle alarm control. A 12 V DC supply with its own fuse and a stand-by/reset switch is built in, so no other apparatus is needed. It runs from 230 V ±10%, 50 Hz mains.
Key Specifications
| Parameter | Detail |
|---|---|
| Experiments | 7 alarm circuits: make, break, tamper-proof burglar, delayed latching, water level, light (LDR), temperature (thermistor) |
| Alarm | Internal 12 V audio alarm, SCR operated |
| Sensors | LDR and thermistor |
| Transistors | 1 PNP and 2 NPN for control; 2 PNP in differential amplifier |
| Controls | Push-to-make and push-to-break buttons; delay and balance potentiometers; 12 V stand-by/reset switch |
| Supply | 12 V DC, fused, internal |
| 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 SCR application practicals alongside the To Trigger a SCR by using a LDR (Product ID: 12891) and the S.C.R. Lamp Flasher with Power Supply (Product ID: 12894). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
Why does the alarm stay on after the trigger is removed?
Once fired, the SCR stays on while load current flows, until it is reset.
What sensors are included?
An LDR for light and a thermistor for temperature.
Is other equipment needed?
No, the board is self-contained.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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