Firing Circuit Using Cosine Wave Scheme Manufacturer,Supplier and Exporter in India
Product Code : EL-PET-1436
Jlab Export is a leading Firing Circuit Using Cosine Wave Scheme Manufacturer,and suppliers in India
Firing Circuit Using Cosine Wave Scheme (code EL-PET-1436) is a power electronics training board on which students study the firing circuit of a single-phase converter based on the cosine-wave comparator scheme. Six op-amps, a triple 3-input AND gate IC, four NPN transistors and two 1:1:1 pulse transformers are mounted on its panel. Jain Laboratory Instruments Pvt Ltd (JLab) manufactures the board in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Object | To study the firing circuit for a single-phase converter using the cosine-wave comparator scheme |
| Low-voltage AC supply | 6 V AC, 100 mA |
| Regulated DC supply | ±12 V DC, 100 mA, fixed regulated |
| Op-amps | Six (IC) |
| Gate IC | Triple 3-input AND gate IC |
| NPN transistors | Four |
| Potentiometers | Two |
| Pulse transformers | Two, 1:1:1 |
| Other components | Adequate number of other electronic components |
| Mains switch and protection | Mains ON/OFF switch, fuse and jewel light |
| Mains input | 230 V ±10% at 50 Hz AC |
| Patch cords | Adequate number of stackable patch cords with 4 mm spring-loaded plugs, ½ metre long |
| Panel terminals | Terminals and sockets placed on the panel for connections and for observing waveforms |
| Operating instructions | Detailed instructions giving the object, theory, design procedures, report suggestions and book references |
| Weight | 4 kg (approx.) |
| Dimensions | W 412 × H 150 × D 310 |
| Other apparatus required | Dual trace cathode ray oscilloscope, 20 MHz (unearthed) |
| Optional load unit | A unit that lets the experiment work as a load, with a 50 W isolation transformer, 40 W lamp, SCR 400 V 4 A, mains ON/OFF switch, fuse and jewel light |
| 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-1436 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does the Cosine Wave Board Compare with the Other Firing Circuit Boards?
| Board | Timing method | Op-amps (IC) | Gate ICs | NPN transistors | Pulse transformers | Weight (approx.) | Dimensions |
|---|---|---|---|---|---|---|---|
| This board (EL-PET-1436) | Cosine-wave comparator | Six | Triple 3-input AND | Four | Two, 1:1:1 | 4 kg | W 412 × H 150 × D 310 |
| Firing Circuit Using OP AMPS And Gates | Op-amps and gates | Eight | Quad 2-input AND | Two | Two, 1:1 | 4 kg | W 412 × H 150 × D 310 |
| Firing Circuit Using Ramp Comparator Scheme | Ramp comparator | Two | Quad Ex-OR, triple 3-input AND, hex inverter and quad 2-input AND | Two | Pulse transformer, 1:1 | 3 kg | W 340 × H 110 × D 210 |
All three boards share the same 6 V AC and ±12 V DC supplies, so the choice comes down to the firing method taught. This board is the one for courses that cover the cosine-wave comparator scheme, and it is the only one of the three fitted with 1:1:1 pulse transformers.
What Is the Cosine Wave Firing Circuit Used For?
The average DC output of a single-phase controlled converter depends on the firing angle, the delay after each supply zero crossing before a thyristor is triggered. The cosine-wave comparator scheme times that instant by comparing a cosine-shaped reference, synchronised with the supply, against a DC control voltage, and fires the thyristor where the two meet. Science and engineering students use this board to follow each stage of the scheme on an oscilloscope connected at the panel terminals and to relate the control voltage to the resulting firing angle.
What to Specify When Ordering
- Quantity — the number of boards for the power electronics lab.
- Load unit — whether the optional load unit should be added.
- Oscilloscope — whether a dual trace oscilloscope should be quoted with the boards.
- Companion boards — any converter or other firing-scheme trainers to go on the same enquiry.
Frequently Asked Questions
Why time the firing pulses with a cosine wave?
Because the average output of a fully controlled converter in continuous conduction is proportional to the cosine of the firing angle. When the thyristor fires where a cosine reference crosses a DC control voltage, the cosine of the firing angle equals the control voltage divided by the reference peak, so the average DC output follows the control voltage linearly.
What does 1:1:1 mean on the pulse transformers?
It describes a pulse transformer with one primary and two secondary windings of equal turns. A single gate pulse can then be passed to two thyristors at once, each secondary isolated from the other and from the control electronics.
Which oscilloscope does the experiment need?
A 20 MHz dual trace cathode ray oscilloscope, used unearthed. JLab sells a Dual Trace Oscilloscope as a separate instrument, and it can be added to the same enquiry.
How is this board different from the op-amp and gate and ramp comparator boards?
It uses the cosine-wave comparator method to set the firing instant, while the other two use op-amps with AND gates or a ramp comparator. The component sets differ as well; the table above sets them side by side.
Is there a load for the experiment?
Yes, as an option: a load unit can be ordered so the experiment works into a load. It carries a 50 W isolation transformer, a 40 W lamp and an SCR rated 400 V, 4 A, together with its own mains switch, fuse and jewel light.
What should an export quotation request contain?
The number of boards, the destination country and port or city, the delivery terms (for example FOB or CIF), any packing or labelling requirements and the tender reference if one applies.
Who manufactures the cosine wave firing circuit board?
JLab, the trading name of Jain Laboratory Instruments Pvt Ltd, makes it at its works in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a manufacturer of electronic lab instruments and training boards in India, incorporated in 2017 and located on Hargolal Road, Ambala, Haryana. This firing circuit board is made at JLab’s own works rather than sourced from a trader, which lets colleges, dealers and importers buy direct from the manufacturer, have every board visually inspected before dispatch and place repeat orders with the same works. The company’s GSTIN is 06AADCJ9848D1ZE, and it holds the Legal Entity Identifier 549300DTGS77DGYD6N03. JLab exports worldwide and ships to buyers in every region — for example Brazil in South America, Slovenia in Southern Europe, Bhutan in South Asia, Sweden in Northern Europe and Ukraine in Eastern Europe. Tender buyers will find details on the JLab lab tenders page.
Related Firing, Converter and Test Equipment
- Firing Circuit Using OP AMPS And Gates — the single-phase converter firing board based on op-amps and AND gates.
- Firing Circuit Using Ramp Comparator Scheme — the version that times the pulses with a ramp comparator.
- Single Phase Fully Controlled Bridge Converter — a converter board with four SCRs, two UJTs and two 1:1:1 pulse transformers.
- SCR And AC Phase Control — UJT trigger circuits for SCR phase control, including a resistance-controlled pedestal with cosine-modified ramp.
- Dual Trace Oscilloscope — a 20 MHz dual-channel cathode ray oscilloscope from JLab, sold separately.
See every board in the Power Electronics Trainers category, part of the Electronics Lab Equipments range.
Request a Quote
Ask for a quotation with the Add To Cart button on this page, or send your requirement through the contact page with the number of boards, the delivery address or port, and any accessories or companion boards you want on the same quotation.
Last updated: 22 October 2026
