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More project information (schematic, parts list,...) on Instructables: https://www.instructables.com/id/Make...

You can get the commercial Solid State Relay here (Affiliate link):
Aliexpress: https://s.click.aliexpress.com/e/_dXO...
Ebay: http://rover.ebay.com/rover/1/711-532...
Amazon.de: http://amzn.to/2hLR9F9

Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:
1x MOC3020 Optocoupler: https://s.click.aliexpress.com/e/_dZQ...
1x BT138 Triac: https://s.click.aliexpress.com/e/_dXj...
1x 330Ω, 3x 1kΩ Resistor: https://s.click.aliexpress.com/e/_dTP...
2x PCB Terminal: https://s.click.aliexpress.com/e/_dYb...
1x Heatsink: https://s.click.aliexpress.com/e/_dXw...
Ebay:
1x MOC3020 Optocoupler: http://rover.ebay.com/rover/1/711-532...
1x BT138 Triac: http://rover.ebay.com/rover/1/711-532...
1x 330Ω, 3x 1kΩ Resistor: http://rover.ebay.com/rover/1/711-532...
2x PCB Terminal: http://rover.ebay.com/rover/1/711-532...
1x Heatsink: http://rover.ebay.com/rover/1/711-532...

In this episode of DIY or Buy we will have a look at solid state relays, find out how they work and when to use them and find out in the end whether it would make sense to create our own DIY solid state relay or whether we should buy the commercial product instead.

Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod
(incompetech.com)