Introduction: DIY Solid State Relay

About: I'm from India and love making projects on electronics, specially with arduino. Internet is the only guidance I have and I've been into these since I was 11.

Ever wanted to get rid of that tic-tac sound electromagnetic relays make? Electromagnetic relays require significant power to turn the electromagnet on/off and need a driver circuit for that, oh! wait! also they need a flyback diode to avoid the risk of inductive spiking which may not be suitable for projects running on battery or projects which you want to be power efficient.

If you want to get rid of all those things in once you are at the right place, here I will show you how to make Solid State Relay using just couple of components.

WARNING:- THIS PROJECT DEALS WITH HIGH-VOLTAGE (AC MAINS) USE FULL PRECAUTIONS. I WILL NOT BE RESPONSIBLE FOR ANY KIND OF DAMAGE CAUSED TO YOU.

LET's GET STARTED!!

DOWN HERE IS THE COMPLETE VIDEO TUTORIAL FOR THE SAME.

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Step 1: THINGS WE NEED

https://www.utsource.net/ is an online platform for technicians, Makers, Enthusiasts, Kids to buy electronic components

Triac- BT136

Optocoupler- MOC3021 (used to isolate high-voltage from low-voltage input)

Resistors- 220 ohms and 470 ohms

LED - Just for indication of state

Breadboard- For making prototype

Jumpers

5V power supply ( I will use my arduino for this)

Finally the Schematic.

Step 2: OPTOCOUPLER

Add it to the breadboard.

Step 3: Add Negative Pin of Led to Pin 1 of Optocoupler

Step 4: Add 220 Ohm Resistor to +ve Pin of LED

Step 5: Add Jumper to Pin 2 of Optocoupler Which Will Go to -ve Power Supply

Step 6: Join Source of Triac to 4th Pin of Optocoupler

Step 7: Add 470 Ohm Resistor Between the Drain and 6th Pin of Optocoupler

Step 8: Add Two Jumpers, One to Drain and Another to Gate

Step 9: BINGO! Time to Test

Step 10: Add Power Supply

I used my arduino mega with blink sketch.

Step 11: Print the Final PCB

Don't know how to print PCB's? Watch this

From HERE you can download the PCB file in .pcb extension.

Don't know how to print PCB's?

PAY ATTENTION- you need to make the traces thick because it is a high-voltage project, to know how to tin PCB see this instructable

To see the working watch the video I linked in Introduction.

Thanks to DIY bloke for my inspiration for this project.

Thank You for coming here

see you again,

Tanishq Jaiswal

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