DIY 40A Solid State Relay (SSR)

Solid state relay is among the discrete components unreasonably expensive. This article describe what you have to do in case you decide to make your own SSR.

Components you may need :
  1. Triac, preferably BTA type since its metal body has been insulated for above
     1KV from mains.
  2. Optotriac MOC3041, preferably  the zero crossing type except otherwise needed
      for random setting.
  3. 47 Ohm 1/2 watt carbon resistor
  4. 470 Ohm 1/2 watt carbon resistor
  5. 78L05 linear regulator
  6. 220 Ohm resistor
  7. 4 pcs IN4148
  7. 2 pcs 100nF capacitor
  8. 2 pcs screw terminal, w/o wall
  9. PCB
10. FeCl for PCB etching
11. Resin