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Let's explore the disadvantages of solid-state relays using the OMRON G3MB-202P and FOTEK SSR-25 DA as examples. FOTEK SSR starts at $5: https://goo.gl/Ufl6JE OMRON G3MB-202P costs $1.8: https://goo.gl/1vIoZW Thyristors: • Electronics step by step - Thyristors ... Solid-state relay (article): http://cxem.net/electric/electric74.php DIY solid-state relay: http://cxem.net/beginner/beginner133.php Replacing a solid-state relay: http://cxem.net/electric/electric99.php