Make Your Own Solid State Relay

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About: Awesome Electronics Tutorials, Projects and How To´s

In this project we will have a look at solid state relays, find out how they work and when to use them and in the end create our own DIY Solid State Relay. Let's get started!

Step 1: Watch the Video!

The video gives you all the information you need to create your own Solid State Relay. In the next steps though I will present you some additional information.

Step 2: Order the Components!

Here you can find a parts list with example seller:
Amazon.com:

1x MOC3020 Optocoupler: http://amzn.to/2zUgwcv

1x BT138 Triac: http://amzn.to/2AYozVH

1x 330Ω, 3x 1kΩ Resistor: http://amzn.to/2hLOI5t

2x PCB Terminal: http://amzn.to/2B0LkbP

1x Heatsink: http://amzn.to/2AZjmNz

Ebay:

1x MOC3020 Optocoupler: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x BT138 Triac:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 330Ω, 3x 1kΩ Resistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x PCB Terminal:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Heatsink: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

1x MOC3020 Optocoupler: http://amzn.to/2jEy2NG

1x BT138 Triac: http://amzn.to/2hLuQQ1

1x 330Ω, 3x 1kΩ Resistor: http://amzn.to/2hMZ7h7

2x PCB Terminal:http://amzn.to/2jEq8ns

1x Heatsink: http://amzn.to/2hLJpCT

Step 3: Build the Circuit!

Here you can find the very simple schematic of my DIY solid state relay along with pictures of my finished board. Feel free to use them as a reference.

Step 4: Success!

You did it! You just created your own Solid State Relay!
Feel free to check out my YouTube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

https://twitter.com/GreatScottLab
https://www.facebook.com/greatscottlab

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32 Discussions

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ranganatennakoon

Question 3 months ago

dear @GreatScott! sir,
this diy ssr can handle inductor loads? if answer is no how can i modify it ? I saw the internet they added additional two capacitors, and sometimes added inductor, how its works, thankyou !

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Question 4 months ago on Introduction

Is there a cheaper way to cool this, as the heat sink is $12

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samir021

7 months ago

Thanx for Your great videos. Is there any way to explain and make single phase shaded motor speed controler with phase angle control with arduino.

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gm280

1 year ago

Mechanical Relays, Solid State Relays and even MOSFET switches all have their place in the scheme of things. Picking the proper one is the option of the person designing the circuit. They all have their pros and cons.

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kgirigm280

Reply 1 year ago

you are absolutely right.

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kschmidt2

1 year ago

Now I'm glad I didn't buy one of these (DC one though) for the ignition system on my bike, though I might try and make something with lower losses if I can. Standard Relay's are fine but I'm looking for a lower overall current usage to take some load off the 40 year old alternator.

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TexomaEV

1 year ago

Love this, please show us a DIY option for switching DC loads. Thanks again for this, because I knew China solid state relays usually don't hold up to the ratings published.

1 reply
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JohnC430TexomaEV

Reply 1 year ago

you switch DC loads with transistors or relays. For a DC load the device must be reverse biased; so a capacitor is connected to the anode and then switched negative with respect to the cathode so the cap conducts all the load current during that pulse time.

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schmitta

1 year ago

Are you an EE? If so where did you go to school?

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JohnC430martinroberge

Reply 1 year ago

check the spec sheets for the diac and the triac. they will tell you how much current is needed to fire the triac and the diac Vbr. when the diac fires at Vbr the current flows thru the resistors to the Triac gate.

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CarraN

1 year ago

Hi! are they indicated to control audio signals?

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SeanB10attanayaka

Reply 1 year ago

I suggest using a relay for the benefits mentioned in the video. Slow but nothing complex about them. Just use a flyback transistor across the solenoid coil and use an NPN transistor between the coil and ground to switch it. 15A is big, pumps switch slow, and ratings are reliable. Sainsmart relay boards are nice because they have optoisolators, protection diodes and relays, and little leds, all packaged pretty cheap. To get a sizable relay for your use, spec it out.

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JohnC430SeanB10

Reply 1 year ago

"Just use a flyback transistor across the solenoid coil" you mean use a diode across the solenoid coil

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JohnC430attanayaka

Reply 1 year ago

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dcalado1attanayaka

Reply 1 year ago

You can use BTA41, not for sure in this project.