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Solderable DIY project kit for Engineering & Diploma students

Product of choice for Engineering & Diploma students worldwide.

Do-It-Yourself Kit

Rs. 4,169

Rs. 3,002

Includes complete hardware with plain PCB and a pre-programmed controller for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. Thorough understanding from the Problem definition to Circuit Design to Programming, Testing, Troubleshooting and finally building a working hardware project.

Tool Kit


Rs. 350

Includes Digital Multimeter, Soldering Iron, Screw driver, Cutter, to be used with Do-It-Yourself Kit to build the project.

Loaded and Tested PCB


Rs. 1,579

Rs. 1,264

Pre-soldered and tested PCB. Choose this option only if you are short on time. Only works along with the Do-It-Yourself Kit. (Can be purchased later)

Total Rs. 0

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The project is designed for a three phase solid state relay system. It incorporates three single phase units where each phase is controlled individually by a power triac with RC snubber network for zero voltage switching.

Opto-isolators are used for each phase to receive switching signals from a microcontroller of 8051 family. Loads are connected in series with a set of triacs being driven by the opto-isolator. The microcontroller is designed to generate output pulses after zero voltage pulse to ensure that the load is getting switched on at zero cross of the supply waveform.

The zero crossing feature of the TRIAC driver, (an opto-isolator) ensures low noise generation thus avoiding sudden inrush of current on resistive and inductive loads. Here in this project we are using two push buttons for generating output pulses from the microcontroller randomly, not coinciding with zero voltage supply voltage of the waveform.

Using a CRO or a DSO we can see the waveform of the voltage supplied to the load for verifying the switching of the load at the zero voltage point.

Further the project can be enhanced by using 2 back to back SCRs ,in each phase for heavy load switching as used in industries. Over load and short circuit protection can also be incorporated for higher reliability.

Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Load Switch @ Zero Voltage.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
Three Phase Solid State Relay with ZVS
Hardware Requirements
  • 8051 series Microcontroller
  • Opto-isolator
  • Triacs
  • Transformers
  • Diodes
  • voltage regulator
  • push button
  • LED
  • Resistors
  • Capacitors
  • Crystal
  • Lamp
Software Requirements
  • Keil compiler
  • Languages: Embedded C or Assembly
Q & A
Q:  Which microcontroller is used in this project?
A:  8051 family 40 pin microcontroller is used in this project.
Q:  What is the concept of this project?
A:  The concept is to switch on the load at zero crossing point using opto coupler and thyristor. The signals can be observed on any Digital Storage Oscilloscope.
Q:  What is the formula for calculating smoothing capacitor value?
A:  There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q:  What to do when the lamp fails and what is the maximum lamp rating that can be used?
A:  If the lamp fails one can use any lamp or bulb which is used in homes up to 100W. We suggest you to go for low watt bulbs.
Average Rating
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Showing 2 of 2 reviews
Kartik Gupta , Faridabad on 3rd January, 2015, 11:00 AM

My Teacher suggested, so that I purchased. I am from ITM University, Gurgaon, Haryana.I found the full description on website, so I purchased and I like components, diagram & description given in CD.Kit was delivered on time with the right components.I directly placed order online.Everything is perfect. I will also give you references.

Nachiket Jagdish, Rajasthan on 7th May, 2014, 04:39 PM

I decided to buy a kit from Edgefx because i was impressed by seeing your website and the concept of the project. I bought a project kit from Edgefx and it was good and we gained practical knowledge.Everything about Edgefx is good.

Rating Breakdown (2 Reviews)

Tool kit cannot be purchased individually.


Edgefx Technologies Pvt. Ltd.,
Plot No. 105, 3rd Floor,
Liberty Plaza, Himayathnagar,
Hyderabad - 500029,
Telangana, India
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